Yeah, I think at some point a lot of toy collectors cross that line into "hoarding." Army building is a little bit of a grey area, but I think that right there is a clear case of someone trying to quiet the demons in his head by buying so many of the same figure.
I just read on a Transformers website that a guy buys 5 of each Masterpiece release. One for robot mode, one for alt mode, one to keep MIB....and 2 more to keep MIB "just in case."
I actually felt kinda bad for ordering the Mezco exclusive cause in my mind it's rather redundant if you have the other two, but I went ahead and got it anyway. I'm glad I was able to stop at one of each.