Because of supply and demand. Both of which can shift.
>Why are writers valued as they are?
Because everyone wants to read what their friend reads. It's a network effect even if not of the same strength as for social networks. So some make it really really big. Most make very little.
It is also a supply problem. A lot of good things that were written in the past are still valuable today. New writers need to compete for people's reading time with more and more great writers from the past.
Software tends to age much faster, and needs constant improvements, so demand for programmers does not decrease over time.
Because of supply and demand. Both of which can shift.
>Why are writers valued as they are?
Because everyone wants to read what their friend reads. It's a network effect even if not of the same strength as for social networks. So some make it really really big. Most make very little.