Up to certain point, but underlying scenario in this movie pretty clearly proves that lot of greed ends up being just greed. Moving numbers around and not actually producing much real value. Were greed to make money from MBS products really needed? Well there was lot of extra debt to spend on consumption, but clear example of it not lasting forever.

Speculation and gambling is greed and not useful sort. Building new factory because you think you can make money is much better sort of greed.