That's a fair point. Come to think of it, hit singles seem to be a lottery - most of the successful ones aren't much different from the unsuccessful ones, except that they reach the threshold of popularity (after which it becomes a positive feedback loop for a while). Spending money on promotion increases the chances of a single to win the lottery.

So I guess I must concede the point. At least in pop music, it could be argued that the value of the work alone is small, and almost all of the value is created by third parties. You gave me something to think about.