There are those who take what they need and there are those who take whatever they can get. Regarding the latter, the compulsion to do so, in itself, defines their need in most cases.
This is yet another factor that distinguishes Man from Beast. And among humans, distinguishes those who are secure, living in a world of abundance created by others like them, from those who are insecure, living in a world of scarcity created by others like them.
You know who you are.