I think they wanted more money than the rest, and would have stopped working earlier, because their ego will not allow them to be ignored. They will have fights with their bodies over the lack of benefit (in this case honor or recognition)
Our ego makes focus on the will to receive, its the system’s programming, and it’s not our fault. However, we an overcome these impure forces and turn the will to receive into a will to bestow, for which a change in our desires to the opposite of what we feel here, if we disagree with this research, is a part of.