Back in the real world, how much would you think the asking price of the first copy of Photoshop or Lord of the Rings should be? And if your answer to that is to put it on Kickstarter, I'm going to laugh. If you want custom development it's going to be $50+ a day at minimum wage, many hundred dollars a day if you want it to actually work (if that's not a requirement you can put it on rent-a-coder too) and nobody's going to "take one for the team". And you've got no guarantee you'll get what you wanted unless you have an iron-clad contract listing exact deliveries with no cure, no pay conditions - and you still have to fight the developer over it. Hell, if any of those methods worked open source would already have taken over since you could hire people to work on it for you today, without changing the law.
People in general don't want that risk, plain and simply. I don't want to fund an author that is looking to write a book or even pay chapter by chapter if I feel there's a risk he'll just leave me hanging in the middle. I'd like him to write it, then I can choose to buy it or not. That is your analogy fail, I want to walk the proverbial isles of the app store the same way I walk in the grocery store, I want to see the finished product on offer and either pay or pass it up. That's how "every other labor industry does" but in your world everything in the store should then be free, because all the work is already done. Real world goods have overhead too, it's not like the price of a pound of beef is literally all cost attached to that pound, there were probably lots of fixed cost that'd be paid if that cow was there or not. But that overhead was spread across all pounds of beef the way a developer spreads his overhead (that is, actually writing it) across all the copies.
Or the TL;DR version: I think $1 for Angry Birds was a bloody good deal and don't see it happening without copyright to organize the "pooling".