That's because they only got into it because Uncle Charlie told them they could make LOTS of money! Most of the bad ones hate what they do for a living but are trapped and can't or won't get out.
There may be something to that. Even as an undergrad, you could tell who had a passion for it. (Just look at the reactions to spending the weekend traveling and doing a survey of stratigraphy in the area--some of us were "All right! When do we go?" and others were "Ohhhhh. But I wanted to ..."
Out of 100 undergrads, there were maybe twenty to thirty who really had the bug, and of those only half went on to actually be working geologists instead of doing something else for a living.