A compensation scheme like this encourage companies to take unnecessary risk to outperform the market.
For-hire CEOs often are also paid in equity, not just stock options. But even with just call options (Which have no downside risk), there is the risk of the professional reputation of the CEO, if you just do middling for a few years and leave, still plenty of job opportunitiess. If you crash and burn the company down... Very tough to find another good exec position again.