If you donated to a server, because you saw they had awesome items would you be happy? Probably.
Ok then what about when you get banned, server goes down, host is an asshole, unstable server, hunted by everyone, or bored of the OT.
What do you do? You want your 150$ back right? I don't blame you.
You would find a different OT and hope its better than the last one.
Nobody refunds and still plays unless they are having RL financial problems, that's obviously more important than a fucking game too.
So take the donations, sometimes you don't even have to ban them, a lot of times I wouldnt as long as i got my items back.
Paypal is a bitch about refunds, so just use Alertpay.