money

As long as they aren't violating the TOS, it's fine. 

SERVER DONATIONS
Anyone who has purchased or has received a gift or press release copy of the game has permission to receive server donations from players. Server owners MAY NOT charge hard currency (tangible money such as cash, credit, bitcoin, etc. that has monetary value) for soft currency (in game currency that has no monetary value) or in game items. Server owners MAY allow priority access to players that make a donation.
So basically accepting donations is fine. If they are direct selling server virtual currency for cash, or are selling items for cash, that would be in violation.

 
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