It's not only in Play to Earn games but all games in general, fun and enjoyment while playing the game matters. There are problems both with the Play to Earn games themselves and the users themselves as well. Play to earn games focuses more on the rewards than the fun. You will see that most of the play to earn games are boring. I still remember Pegaxy where you can just click a few times and then you will just watch you Pega run and run until you win. I mean it's very boring, but people are only playing just because of the rewards. Surprisingly, the project is still developing until now and there has been some updates on it.