there are many games that have a fairly cheap capital and can make money 2x as much as our initial capital
Gambling games are not an investment type of form. NFT games are investment types and you will work on how to make them successful. You will choose a worthy NFT based on your research and will do everything to make it profitable for you in the long run.
Can't be compared to the usual gambling where all you need to do is to wait for the result after your series of analyzation.
Don't think that NFT games are a gamble unless you will choose an obvious failed NFT game.