That argument makes little sense. Of course people get paid for their work. The TBP operates in the pipeline _after_ people already got paid.
Mmmmno. It's still an investment they make. The equation does not work without paying customers. Either they are in loss at the release and need to recoup the production costs with sales. Or, they want to acquire enough money with sales to make investing into the next product feasible.
One doesn't run into viruses much (at all) anymore, but malware. Viruses are ment to cause damage (say format a drive or turn your view upside down), malware doesn't call attention to itself as it would prevent it's collection or access.
There is no such rule. Viruses are simply a subcategory of malware. That's of course not to say that viruses wouldn't be quite rare these days -- trojans and worms are much more common.
Why haven't you gone the cost effective route and built a hackintosh?
Utter waste of time. Hackintosh is something you mess around for a weekend, but not something for your daily driver. It breaks as easily as a house of cards. It even makes Linux look like a robust desktop OS.