Some commission plans have a "windfall" clause where very large deals (anything over x% of your quota) goes to a review process. The sales person then negotiate

Some commission plans have a "windfall" clause where very large deals (anything over x% of your quota) goes to a review process. The sales person then negotiates internally for the most commission possible while the company negotiates to pay an amount acceptable to the sales person while being just large enough to keep them happy but not so large they retire.