GPL promotes evolution, but not capitalism.
GPL allows a popular product to develop an unnatural saturation which diminishes market value.
GPL allows a popular product to evolve at such a rate that could cause potential users to become timid about adopting the product.
GPL allows an unpopular product to stagnate which diminishes the ability to “coerce” the end user to spending money on upgrades.
And in case you are still not convinced…
GPL is the devil.
The money to be made with GPL is in the software maintenance contract for a product after it’s developed, not the actual development of the product. Given a choice of getting $1 from 1000 people or getting $1000 from 1 person, prudence says to spread the risk and take the $1 from 1000 people.