If the company hits it big despite them, the stock is awesome.
If the company does poorly they might miss a bonus but they'll still get their inflated salary.
If the company ends up on the rocks, they'll get their salary cut "till company performance improves" as their pay is usually tied to the performance of the company as an incentive.
But what invariably happens is that, even with their pay tied to company performance, the moment it gets cut, they high tail it out of there and land a new job with their top-10 MBA and another couple years of job experience...saying "I'm looking for growth opportunities" over and over again in their interviews.
I don't know if it's still true, but Facebook used to filter out these types by making them do a version of an engineering interview. Except instead of regurgitating algorithms you learned in college, MBAs had to regurgitate stuff from MBA school. Like derive the time-value of money, or discuss the TPM or whatever. The ones who coasted through MBA school got filtered out really quickly and the ones who took the subject seriously might pass the gauntlet.