Sell ? Who buys items for a game from other players? If that’s why youre worried then you should have an open and closed bnet separate (singleplayer offline to multiplayer). I spent 80.00 bucks buying this game on PC and Switch, as well as my collectors edition from 20 years ago, i think it was 80 and then the expansion. That’s more than enough money to pay for a game with the potential to produce all sorts of items. Maybe let that market die and stop feeding it, that’s a better solution.