ONE of my sites would be in the trades you are talking about. I think that is Ok to say that.
I am a web marketer though not an SEO, I am just really good at SEO as I have been doing SEO/since before google came along, way back in the days of lycos, alltheweb, altavista etc. I understand sales and marketing, and what it is like to be a salesperson. I give my sales teams targets, once they hit their weekly/monthly target, they can do what they like, no need to come into work.
I want to make it easy for them tosell, but increadibly hard for them to leave. They get a monthly recurring % of ALL sales for as long as the clients remain with us. or until they leave. Once they leave, they lose the residual bonuses.