I think for those who stand in line for Black Friday sales it isn't a greed thing, it's a fun thing! I've never done it, but I AM a couponer and getting the best deal on the thing I want is as much a game as a necessity. It feels good to save money -- it's "winning" at a hobby, plus it's a very social activity and yes, it has a positive impact on the bottom line.
All that said, I'll be staying home on Friday unless there's something I need, in which case I'll go at lunchtime when the campers have all gone home. I may go out for Small Business Saturday, but I would have done that anyway. Cyber Monday though -- now that's a tradition I can get behind!
Happy Thanksgiving!