EOS Knights is basically an economy microcosm, the whole point of that game is to get efficient in trading with ingame items, otherwise it is rigged for players to lose money. It is not really a game, it's a numbers simulator.

I find it fun to test new blockchain games to see how their economy is holding. When you introduce real world value (blockchain items) inside a game you end up with paradigm shift. Also like you said, game needs to be fun in order to get a larger audience. Crypto games that manage to get gameplay and economy right will be the next big thing in crypto.