With absolutely no data to back this up, I'll posit the following speculation: In the short- and medium-run, these business cost more jobs than they create. I

With absolutely no data to back this up, I'll posit the following speculation: In the short- and medium-run, these business cost more jobs than they create. In the long run, they rid the economy of relative inefficiency (relative to the 'improved' marketplace), which creates a healthier economy (creating jobs being one symptom of a healthier economy).