Sure, but how am I different from million other guys on the street or Opensea.

Lets start at the beginning. You have analogy wrong ( which is a problem with analogies - they are open to interpretation ). The joke part says the following:

1. You have a wife. 2. She is not behaving like your wife. 3. You have a marriage certificate saying she is your wife

And NFTs follow the same pattern, because:

NFTs say they are your wife. They do not behave like your wife ( everyone can have them ). You have a digital certificate saying that NFT is your wife regardless.

**

As a guy on the street, I only see a value of selling fake wife certificate. I do not see value buying it.

I hope I explained it right.

> As a guy on the street, I only see a value of selling fake wife certificate. I do not see value buying it.

You just described the whole NFT scam. I would love to produce pngs I can sell for thousands of dollars. I won't buy NFTs not even for a penny.

Well, it seems you have your own analogy wrong ;-) [By the way, the “A marriage certificate that you bought from some random guy on the street and has no legal significance.” was not mine.]

If the NFT is the wife, what is the certificate?