If you're not in extreme poverty and still think that bribing kids for money is a good idea, you should maybe get your head checked.
How do you still not get that it's optimal to set up a donation system so you don't have to run a server out of pocket? There has to be an incentive created to make people want to spend money, and giving them benefits (not too big of benefits, mind you) is a quick and easy way to do that.
I'll simplify it for you: tezuni is an adult and pays adult fees, and since adult fees are sporadic at best, he'd rather save money by having a donation system set up. I don't think it was ever implied he can't afford to host his own server, because I'm pretty sure the donations are keeping the server self-sufficient thusfar