No they're not, but with every industry and sector scammers will dwell
The NFT industry is a scam.
Suggesting that "every" NFT has collector value is even worse than suggesting that every item in the real world has collector value.
It is sort of true over a very long timescale but it is not true in the way they are being sold.
There is a difference between something and a subjective representation of that thing. Thing Gold vs. fiat Money arguments. One is a physical thing and the other is a representation of a thing (rather than just being seen as a piece of paper).
NFT's are only
globally non-fungible within a certain (limited) scope and that is the difference between them and real world objects.