As others have mentioned, you might want to try to pull the business out of the company and get a better sales rep, with a more appropriate single digit or less equity.
This kind of ego trip happens all the time in companies, when a sales rep closes a deal for X$ and they believe they just made the company X$ profit, fully ignoring not just all costs, but also every single contribution from everyone else at the company that put them in a position to even try to sell whatever was pitched, and everything that will be needed to deliver it.
That's perfectly fine mentality for a sales rep, but no for a CEO. Which seems obvious.