It doesn't matter if they're complicated. They have to be games first, and even then have to be sustainable because players need to spend money for others to earn money, and that won't happen unless players deem it worthwhile. We have seen what happens when you make a game designed around trading, Artifact died because baking the economy into the game ruined it. It needs to be organic to a large degree, and it needs to not take away from the game. Put the current prospect, as you yourself are essentially saying by focusing on coins, wallets, profiting, etc into the picture and you get Artifact-but-only-other-people-trying-to-profit-play-the-game-and-aren't-actually-interested-in-the-game which ends up in the scenario I described. Which is basically again, a pyramid scheme.
Like, I've seen a bunch of these NFT games minting "legendary tier equipment NFT's" and they don't even explain what they do, their stats, and why anyone on earth would need this for their game. Imagine being told "oh, you have to buy that 1/1 unique item from that guy over there for real money to clear the next stage, and then you can sell it to the next player who wants to clear that stage, and they'll do the same". I'd just quit because the odds of someone else choosing to spend money to buy from me are.... low. That's not the kind of game most people enjoy, it's like expensive arcade machine gaming.
The whole concept falls apart when it's all about investments, and by nature investments are meant to be recouped. Which really means exiting the investment, so support is only skin-deep.
