From what I am reading, you have a very fair capout. This is very common in the roofing industry with the stormers. The averages are 10-20% office with anywhere from 35-50% split after job costs and office taken out. On your example of the office fee being more than the commission on a $6,000 job (office fee would have been $600), it seems as if the salesman didn't sell the job for enough money. Obviously, the more profit in a job, the more commission. Sales price means nothing on this type of commission schedule. Sell a bunch of $2,000 handyman jobs with $250 bucks cost in them and you make as much commission as your $6,000 example. Two words of advice on this type of commission schedule.....HOLD GROSS.