My go-to example is always Enron, and the impact on employees whose retirement funds were in their own too-awesome-to-fail employer.
Oh, sure, it's way worse because of the fraud-angle, but even if it had just been a more honest kind of mania, the arrangement was reckless and bad.
stock options/rsus are a great example of some sort of cognitive bias (maybe it's the endowment effect?).
give somebody $1000 worth of shares in their company, and a lot of folks will hang on to them. but if you gave them $1000 cash to invest, they almost certainly would not choose to dump all of that money into their own company.