There are several points that make NFT have value.
1. Art value (this usually applies to NFTs backed by physical art, photography).
2. Utility value (this is usually found in special NFTs such as NFT Pass (hold the NFT to join the service)).
3. Artist, this is still related to point 1, who made the NFT, and its value will increase because the NFT was created by someone who is an expert in making digital and physical art.
4. Earning, I don't think this needs to be explained. You definitely understand this point.
Even though NFT memes seem to have no value, most of these memes are used as NFT Passes or earn a tokens. However, not all NFTs have value like this, a lot of NFTs are generally the same as meme tokens or sh*t token/coins, which have no utility and are then simply abandoned, so the holder doesn't get anything.
NFA/DYOR/DWYOR