Quote from Venusaur
The item is part of the game, which you can still access on your own server, or singleplayer. What I'm trying to say is that specific server isn't part of the game, so you aren't entitled to anything from that server.
You bought the ability to play Singleplayer, and Multiplayer. You can still do both of those things regardless if people charge for items or not.
I can't believe you're seriously making this argument.
When you set up a server you're under obligation to have all the game's content available for any player in the server, for free, you can't get them behind "donations". The game content is not your property to resell for players that already paid for them, doing so is nothing but a scam.
You can charge for access to the server, since the server is your property, but you can't restrict game content from players once they're in it.
But i can see why you're making this argument, since you yourself profit from the scam: http://shilocraft.buycraft.net/
Also, a protip: If you give something back for a donation, it's no longer a donation.