If you never purchase any items then obv you have nothing to worry about.

Looking for a fennec? No longer can you simply find one that a player has in duplicate for a few bucks, or get it from your older sibling or friend. You will pay whatever Epic decides it is worth.

Idk if they mentioned something specific about new dupe handling features but you would be forced to trade in your dupes for random trash that you also don't want (and could have in duplicate again).

It's pretty obvious to Epic that the credits should only flow in one direction: from the player into epics pocket.