I have seen people drop over $1000 dollars in gifted subscriptions/coins over the course of a single stream where a guy is just playing a video game. I'll admit that this kind of thing isn't common, and you definitely aren't going to find 100 people with that level of disposable income for your following, but there are plenty of people who blow what seems like an unreasonable amount of money just so a stranger on the other side of a screen will notice them.