> If an artist sells his art the first time for $10, and the person resells it for 10000$, then the artist should be compensated too.

This is far from axiomatic[1].

Also, presumably you can move up a level of abstraction and sell the identity that bought the artwork for $10000. The blockchain doesn't need to know that the keys have changed hands.

[1]: https://en.wikipedia.org/wiki/First-sale_doctrine