It's probably hard to measure, because there are many reasons to act like you have the delusion, even if you don't. For example, to avoid physical danger, to a

It's probably hard to measure, because there are many reasons to act like you have the delusion, even if you don't. For example, to avoid physical danger, to avoid social ostracization, to benefit from the social network, to gain power and influence, etc. The delusion (or at least it's theatrics) is part of a bigger social package. It's a bit like product bundling, or subprime mortgage securitization, or suspiciously large wooden gifts. The good parts are good, and the bad parts benefit from the aggregate value function.