@Cerberus Ah, actually in that case, I do not see any reason for you to not have a blocker enabled. If you're going to donate them by other means, then sure (for e.g. I think Destructoid does offer you to buy stuff or something like that).
The problem is that the majority won't donate if they only relied on such methods (this is especially true for small sites). So the website admins don't have any choice but to enable ads to keep themselves running. You can't blame them.