Nice Guys Finish Last song meaning

Most likely "nice guys" in this song are the people that are commonly referred to as 'suck-ups'. They do everything they can to please 'useful people' because they believe they might get some kind of profit out of that. They keep pretending to be nice, but it doesn't get them far in life. "Bit the hand that feeds" - sooner or later they break down and show their real nature, materialistic and insincere; obviously, that erases the effect of all the previous brown nosing. Now after all the sucking up and "living on command" they end up with nothing - "nice guys finish last".