You are allowed to charge players to access your server
So long as the fee is the same for all players, you are allowed to charge for access to your server. You are not allowed to split your playerbase into paying, and non-paying users, nor can you restrict gameplay elements to different tiers of player.
Basically, if you’re charging for access to your server, you are selling a “ticket” and there can only be one type of ticket, regardless of how much people are willing to spend.
You are allowed to accept donations
You are allowed to accept donations from players. You can thank them publicly or in-game, but can’t give preferential treatment for donating. You are not allowed to restrict gameplay features in an attempt to make money.
You are allowed to provide in-game advertising or sponsorship opportunities
You are allowed to put adverts in your Minecraft worlds to help with costs. Used within reason, adverts and sponsorship can be appropriate ways to fund a server.
You are allowed to sell in-game items so long as they don’t affect gameplay
We don’t mind you selling items in game, but they must be purely cosmetic. Pets, hats, and particle effects are OK, but swords, invincibility potions, and man-eating pigs are not. We want all players to be presented with the same gameplay features, whether they decide to pay or not.
There is one exception to this rule – capes! We have a lot of fun making cool capes for extra-special members of our community and Minecon attendees. We’d like to keep them as exclusive as possible. So, yeah, no capes please, even if you’re giving them away for free.
You cannot charge real-world cash for in-game currency
We don’t mind in-game currencies which are earned through playing, but you are not allowed to sell them for real-world cash. Remember – if the stuff you sell affects gameplay, we’re not cool with it.