You have an extremely weird idea about the relationship between “how much something sells for in the market” and “how much something is worth”. Could you answer how you view this relationship for the following things?

1. Your kidneys, or heart, or any vital organ.

2. Weapons grade Plutonium.

3. Falcon heavy.

4. A single grain of rice, 100 million times.

What you are saying implies “we don’t have a good marketplace for user data”, which is pretty obvious. But I have no idea how “thus it is worth nothing” follows from there.