Being greedy is to want more than you need. Not necessarily a bad thing especially when living in a materialistic/capitalist society. Being greedy in its self is not bad. Doing bad things to satisfy your greed is what makes it horrible sometimes.
I already make 100,000 a year.
I want to make 1,000,000 a year.
Being greedy isnt really bad now is it?
(This is just an example, I dont make near that much)