Why don’t we establish a free market for sperm and let the best ones win? Surely people would pay a lot of money for the sperm of a gifted man? Putting some go

Why don’t we establish a free market for sperm and let the best ones win? Surely people would pay a lot of money for the sperm of a gifted man? Putting some good money behind donation would then encourage more men to do it, leading to more variety.