What, exactly, is the purpose of hanging in the clouds of Venus ?
What, exactly is the purpose of hanging out in the near-vacuum of Mars?
What, exactly, is the purpose of life?
If you don't agree with the merits of the human race becoming a starfaring civilization centuries from now based on investments made today in getting the ball rolling today, I'm not going to debate that with you. But if you agree with that, then the whole point in expanding offworld is to develop into a multiplanetary species, where demand drives down launch costs and we learn, step by step, to make everything that we need in offworld environments and to become adept at the multi-month journeys between planets. At first, it's a sunk cost. With time, it's increasingly supported by trade. And after long periods of time, it brings the immense resources beyond our planet into our grasp.
If you want to talk about economics on Venus, here's a few for you.
* Power is immensely abundant. Many technologies that we employ are basically energy costs - to pick an example, isotope enrichment. So once the higher marginal capital cost for doing things on Venus becomes overtaken by the greater energy availability, Venus becomes the logical place to conduct such activities.
* Deuterium levels are ~240 times higher than on Earth. So depending on the level of enrichment you need and the means by which you return it, if you can return goods for somewhere in the "couple thousand to several tens of thousands of dollars per kilogram" range, it's profitable. Deuterium recovery can be rendered an inherent part of nighttime fuel cell power storage, since electrolysis has an excellent enrichment factor.
* Venus's lavas appear to be highly differentiated, and there's a great degree of chemical weathering and atmospheric processing, which can be another resource enrichment process. So concentrations of high value ores far greater than are found on Earth are not unrealistic. There are a couple dozen elements whose values are worth exporting at realistic launch costs several decades from now.
* Even simple rocks from offworld have great value (collectors, luxury goods, etc). It's not theoretical - people really do pay huge sums for offworld items. Their value will of course depend first the abundance of their export (if you export 100kg per year, you can sell for 10x more per kg than if you export 10000kg per year, which you can sell for 10x more per kg than if you export 1000000kg per year...). If you're selling in small quantities, the value could be in the millions of dollars per kilogram. Venus's surface atmosphere is dense enough that you can outright dredge loose rocks.
* The size of the market and sensitivity to export quantity also depends on their aesthetics (aka, moving more from the collectors market into the larger luxury goods market). This means minerals that are durable and aesthetically pleasing. What we've sampled so far of Venus's surface fits that bill - gabbro (sold as "black granite" - large crystalled, dark, hard rock, forms excellent slabs), anorthosite (rare on Earth, often associated with labradorite, which is an iridescent bluish-purple semiprecious to precious mineral), troctolite (rare, olivine (peridot)-rich relative of anorthosite and gabbro - looks like this when cut and polished), etc. It's one thing for your typical sheikh or dotcom millionaire to say "my yacht's countertop is made from the finest tuscan marble." It's another to say "my yacht's countertop is from freaking Venus." You're looking at a very large market in the 4 figure/kg range, a reasonable market in the 5 figure/kg range, and a small but decent market in the 6 figure/kg range.
* Venus's apparently high levels of repeated differentiation, in conditions very different from Earth, likely mean that some minerals, including gemstones, that are rare or nonexistent on Earth exist there, potentially even abundantly. The gem market on Earth is massive, and always looking for something new to set their gems apart and boost their value. The value per kg of gemstones makes even the most expensive rockets look cheap - a single diamond of a rare type can auction for upwards of the cost of an entire Falcon Heavy launch.
* On the opposite side of a spectrum, once a colony is "mostly" self-sufficient, it can justify imports just by "telecommuting". If a colony can sustain itself by, say, 80% of people working domestically, with the import-needs of the whole colony averaging out to 5kg per person annually, and a telecommuter's salary can pay for the import of more than 25kg of goods, then the colony is on a whole running cashflow positive just from telecommuting labour.
* Part of the goal of people like Musk is cost reduction so that travel between planets becomes an option for anyone, including those just looking for the experience. Look at how many people risk their lives and spend a good chunk of $100k every year trying to climb Everest. On Venus you can skydive into hell, to a surface where you can fly, around mountains covered in things like tellurium or pyrite frosts and snows, where cliffs are steeper and higher than Earth's crust can physically support and where riverbeds have been carved by unknown substances, most likely exotic lavas like natrocarbonatites (looks like oil, flows like water, and glows crimson at night). Of course, your habitat itself is big enough to support skydiving indoors. Tourism becomes most definitely an option.
* Meanwhile, people to whom the concept of living a pioneer life is appealing - making things with your hands, harvesting and processing plants, even things like homemade soaps and paper - can afford to sell their homes and go live that life if they so choose. The overwhelming majority of people won't choose that life; the fraction will be very small. But a very small fraction of billions of people is still a lot of people. A reasonable "budgeting" scheme for a colony to sustain itself would be to require everyone to purchase a round trip ticket and prepay (before each launch window) their share of the colony's imports; if they can't afford their share of the next launch window's imports, then they leave at the next launch window. Also included would be an agreement that they would conduct a share of the colony's labour, with them also making a down payment to cover the costs of bringing in (subsidized) labour if they don't have a job there (or are fired for failure to actually work); so long as they continue to do their job, they only have to cover the cost of their share of the imports. More well-to-do people could just opt to keep paying the labour cost every year so that they don't have to work. By contrast, people who don't have the means to afford a trip on their own could go there for the job opportunities. And there would be a wide range of work - agricultural, food preparation / processing / storage, laboratory, medical / dental, construction, maintenance, manufacturing, refining, remote piloting of surface vehicles, janitorial, and on and on.
Now, concerning space in general: If you think humanity should just wait, or forget about that altogether - you're certainly entitled to that belief. But otherwise...