Examples: Real estate Brokerage &
Investment banking
Etc.
I am intrigued by the idea of no commissions in some if not all sales jobs. If the person isn't selling you can fire them. If they do well in the managers judgment you can bonus them. While it is subjective, almost all business decisions are. A good manager is good at making good subjective decisions.
Perhaps I've been soured by the particular salespeople I've worked with, but I don't think it's a job that ethical or sane people thrive in long-term because there are eventually going to be situations where management expects results that can't be achieved without deceptive behaviour. Most of the successful salespeople I've known have been greedy, delusional, unethical, or borderline sociopaths. The really good salespeople are the ones that can hide it until a critical moment.