Does anyone here have any experience either working within or negotiating with build on your lot companies? I'm currently in negotiations with one of those companies building in the Pacific Northwest, and any information you have would be very useful for me. 

I'm particularly interested in your thoughts on which areas of the contract typically have the most profit margin built in (I believe it to be most upgrades), what margin percentage the companies usually target, how the commission structure is set up, and any stories of what has worked for you.