I honestly think that the significance difference would be related more to the individual temperament than the perceived v.s. actual material value. The problem is that both of those things influence each other, so the randomness.
The statement (in words) would be like this, the weighted significance between perceived v.s. actual material value is a variable that is tied towards the individual's temperament, up to a point where actual material value reaches some arbitrary threshold of say 100 million dollars, where it then becomes negligible, but then it is entirely a factor of the individual's temperament. However, I also believe that one's temperament is also affected as a variable of one's actual wealth, however this is then a classic nature v.s. nurture problem, and while we can get it into set theory, we cannot solve which comes first, we just have to start taking data and testing our weighted categories against actual material results.