This is a terribly common refrain. Perhaps all freelance developers in a given area should collaborate (read: collude) and come up with an agreed upon, open source scope of work document framework? That way, setting aside variables like price, feature requests, and time estimates, there can at least be a common structure that developers in a particular geography can rally around to at least attempt to minimize the impact of this type of problem.

This is the precise reason why I am trying my best to come up with my next start up idea, client work is a drain...