Why are games alone the main potential for NFTs?
It's because they're usable for the game. Unlike the NFT arts and other static NFTs, they're good like you're holding a painting and any other memorabilia and you'll only make a profit out of it upon selling it.
But with NFT games, you buy the NFT alone and that's going to be your starter that you'll use to generate income as you play the game. That's why the potential of the NFT games is very big.
Not all things have to be motivated by money. in retrospect, people are collecting a stamp, card, and even a mug. There exist the kind of people who like to collect antique things. I believe NFT have the possibility to serve that kind of people, the ability to showcase things/art and with a verifiable of ownership could become an awesome technology that many can be benefited from.
So I disagree if gaming is the main potency of NFT, not to mention, people are playing a game to have fun, not making money. Although some people monetize their gaming experience, if the core motive of people playing games is solely based on money, it won't sustain.