hm.. i think happystick used to have pretty big donations (with videos out there). well, it covers part of your living but first of all being a good gamer is not enough - to get many subs/donations and such you also need to be a good entertainer. like cookiezi probably doesn't make that much in donations, but he also doesn't talk, show his face or does any special stuff (well. besides godlike plays ofc). beasttroll, happystick or www are both good at the games and entertaining (for most people, always subjective) and then there's people like miraie (not purely osu!), tokaku, squashy, etc. who are more active on youtube and aren't great gamers (well tokaku is pretty good but not top notch) but more entertainer. there it depends a lot. but all in all it's very fluctuating and you definitely can't quit your job or school if you are on this list. if you made millions of dollars like idk ninja or whoever, then you can just quit real life. or if you are great at a popular game like dota and win the championship. but otherwise.. ¯\_(ツ)_/¯