Because the customers are also old as shit and have more disposable income.
5$ a month for some patreon porn is unthinkable when you're 17 but if you're 25 or 30 and have a job it's typically the kind of money you start throwing on stupid shit.
5 year old kids who play Roblox or "free" gacha games probably wonder why we spend 70$ on ours and think we're colossal retards too.