Every gay person I know, myself included, is on prep. From the VP at a Fortune 500 on down to a coffeeshop barista. Cost is not an issue, at least not in the United States.
Pretty much exactly what you expect given than promiscuity is not taboo in the gay community.
All in all, HIV just isn't a problem anymore. It's on the same sort of threat scale as any other STD. Even if you're infected, you just continue taking PrEP (technically PEP) for the rest of your life and that's about it. Normal life expectancy and not much other health complications for most people with consistent treatment.
The $40k+ price is the cost of the 2x pa injectable form. This is a relatively newer treatment and not widespread.