For starters, horny guys will spend a lot of money. Also, in the US at least, making $100k or more is only 85th percentile or something like that (even lower if household income). With hundreds of millions of people, there are *a lot* of people making a lot of money. Sure, $100k isn't *that* much in the VHCOL cities, but it's still plenty to waste some money on OF. Then even $200k is like 95th percentile or something, so there are still a lot of people making even more than that.
Then we live in a consumer nation (and world). Even those not making that much don't see that they're buying a $40k car, they see they're spending $600/month or whatever. They stop at Starbucks before work every morning, go out to lunch every day, spend on subscriptions they don't even really need like Netflix. They don't actually add it up to see the true (monthly/annual) cost. Dropping $35 on a porn site won't be that much to them, especially if they've been sitting at home for 1-2 years, are annoyed with their family (not used to spending this much time with them), want some alone time, etc. Yeah, spending $35 and getting ripped off sucks, but people with money to spend aren't going to lose sleep over it. They'll make sure never to sub to her again.