I had a guy work with me, and a good guy too, the days take was only 50/60% higher for the two of though.
I was paying him 35% and hardly made any more money.
Once you work with another, you lose your freedom, it's no good when your working an estate, and the other wants to finish at 5pm, and you only have two more houses to do to finish the estate.
It didn't work for me, but it may for you.