You are taking all the risk, he's getting a 10% profit share (make sure this is after tax and all of your costs) and he is getting the security and benefits of being an employee. If you think it is fair, I would be inclined to say "times are hard and that's the deal for someone who is not investing or taking any risk". If you could train others to do it, then advertise the post. Personally I would not give away profit share. I would do a capped bonus tied to satisfactory performance from him, including new business generation and excellent customer feedback.