I think the only way it would work is if you paid very close attention to QC and you were willing to fire anyone who violated the code or did work not up to your specifications. The business owner would have to have cut and dry rules about what is acceptable and what is not, example: Backstabbing receptacles. Nobody who works in the service department where I work backstab and theres 8 of us.
The business owner would have to pay a high enough rate to get the quality of work they expected. If I'm going to make less money for doing things in a workmanlike manner or more of a workmanlike manner then of course I'm not going to be happy. If your company is the type where you don't worry about what things look like as long as it meets code I think it would work for you.
I don't think the IBEW using piece work proves anything, I've seen hack work done by IBEW Jman.
