Comment by knightofmars

The sales process needs both rewards (commission) as well as punishments (commission loss based on unmet delivery). The idea, "As soon as the contract is signed I should get my money." is a broken one as it reinforces the type of behavior that leads to unrealistic promises being made. The 50% at signing and 50% at delivery model is better for this reason. Yes, there would need to be additional language surrounding what an "unmet delivery" would be and how it would be gauged with relation to promises made during the sales process.