@y0landi showed me this. Not a super big problem, just something that hasn't been changed I think. Compasses are currently worth 30$ to the server. In the wiki, however, there's a small blurb that says this (Important part in red): TeleportPlus /jumpto or /jump or /j (Teleports you to the block your cross hair is directed at. Simply allows for quicker travel. Do not attempt /j across the border as it will load unnecessary chunks and may impact the server negatively [server spikes]. There are known bugs with /j, that may teleport you underground. /j is also restricted to certain distances as well.) (Not available in the nether) /top (Teleports you to the highest block above you. Useful for escaping caves.) (Not available in the nether) /kit compass (Gives you a free compass. This command can only be used once every 12 hours. Compasses are not sellable to the server, therefore they will not interfere with the /sell all command. However if you have the /clearinventory command, they will be cleared out.) (Not available in the nether) Hold a compass (By holding a compass, everytime you left click you are basically using the /jumpto command. This is a great fast way to jump around and travel!) (Not available in the nether)
https://www.ecocitycraft.com/wiki/index.php?title=Server_Commands About 2/5 the way down. Or if you search for "compass", it is the fifth instance of it. The easiest solution would be to just edit that line out instead of making them not sellable. And I say that purely from a n̶o̶n̶selfish reason.