I agree that it's lame for people to require a donation, but you'd be amazed how many obviously rich, high level players will stiff you or hilariously lowball you on ports with like 5pp or something (with no explanation or apology). It's annoying and kind of insulting. Once that happens a few times to a guy who's expressly porting for money (most likely a relatively new player) I can't blame him for setting a fee.
Basically the cheapskates cause this behavior to emerge by not tipping.
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