It's clear that people will work hard for many things besides money; to suggest otherwise is absurd. The evidence is right in front of our noses, every day: Consider artists, scientists, scholars, soldiers (some of whom risk their lives in the worst working environment you can imagine, and need food stamps), teachers, FOSS software developers, explorers, parents, political and social movement leaders and members, etc.

(I wonder how much Adam Smith made? I also wonder if he really said the things he represents to us now.)