14 reasons to be a supervillain

Good, well thought out list. Always useful to go beyond greed as the main motivator. [Link]

14 Motives for Becoming a Supervillain

01. Greed
02. Sadism
03. Seeking Vengeance
04. Power Trip (including Megalomania)
05. Sheer Insanity
06. Fanatical Reformer
07. Patriotism
08. Survival
09. Wrongfully Accused
10. Undercover Good Guy
11. Brainwashed
12. Ignorant Obedience
13. Action Junkie
14. Family Tradition

Gone into much more detail at the link.