So a few points about cashing out. It definitely impacts the game economy, this much has been explained by InfinitySquid, the Monetization dude at Immutable, here https://blog.godsunchained.com/2022/07/29/state-of-the-economy-july-2022/

"When players are all seeking to extract more monetary value than they put into the product, there is no way for the product itself to be sustainable."

Which is easy to understand, if overall players put for example 100 ETH into the game every year, but extract 200 ETH, where is the difference coming from? Some cashing out is necessary to attract players, but there must be incentives to enjoy the game and hold on to assets, instead of removing value as much as possible.

You say the cards would be worthless if the game starts to look like dying, but that is true regardless of the cards being NFTs or not. The crypto / web3 component doesn't change this. This is also true for any other system of selling game assets - it's always the other players who need your junk, who else would? Diablo 3 had an auction house once (no NFTs) where people could spend dollars to buy items; if nobody was playing the game, who would spend dollars on in-game items? This point is kind of a given, as it is true for every game, regardless of the way players are able to sell what they collect / earn.

Also if I could suggest a couple of improvements:

• You wrote "My merger daily earnings" but I think you meant "meager";
• You added a separate legend to the earnings image, when you could have replaced the filename. You can go back to the post code and replace the proper legend where the filename is. You can also do that for the other images, replacing the automatic filename legend for your own.