"Need" on registered items shouldn't be allowed.

[Post]

The problem with your suggestion is that, for people like me who don't care that much about minion collecting, if I win the minion I can no longer put it on the marketboard for someone else to get instead nor give it away, all that suggestion really does is enforce usage of it. Minion drops are already rare as is, and there are plenty of people who get absolute fodder loot rolls, me included. At that point why even bother making anything registerable marketable?

Most of what OP has suggested actually puts you at an advantage of you're someone that never 'uses' minions, as now you're potentially in a party and the only one that can need on it is you, because everyone else has already acquired them.

And, I doubt they could even implement something to prevent sale of items you haven't 'acquired' without some huge rework of the game's items, so that doesn't seem likely to happen.

If everyone already has it, they can still use the greed button. A change like this won't suddenly plummet the supply of dungeon minions on the market board.

[Korbei]

Cards shouldn't be subject to rolling at all. They should just drop into your inventory in all cases.