I usually get donations from people that asks for major feature implementations in my add-on(s).
Though as long there are no direct ads and they don't bother people (such as popups, chat spam and so on) I support donation buttons, both on sites and in-game.
The one reason why they should be in-game is because, as mentioned earlier, are other leeching sites and the automatic updates.
And also as spiel said, if its free, why pay?
Don't think of it as a payment, think of it as a gift (this goes for the end-users).
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