Question about what is allowed by server when asking for donations

There is a server that is modded. When joining that server text comes up that tell us that we only get 50% xp and that we have to donate to the server to get 100% xp.

What I was wondering is if this is allowed by you guys. I know people cant charge for mods, and you guys only sell things that are cosmetic in nature. So to me it seems like that their practice of forcing someone to donate to get full xp would be like selling a mod but of course its not my opinion that counts, Its yours.

Question about what is allowed by server when asking for donations