I have a few [wealthy] salespeople friends. Most have “commission-only” (0 base) jobs.

Many jobs will start you with a base for a few months, while you build commissions, but they stop it, after a while.

They can also get fired at the drop of a hat. Not much job security.

Sales are easy to convert to incentives. Just take a cut of the sale. It’s not so easy to calculate value from other jobs.