I usually buy 2-3 of each character I find. One is for display, one for custom, and (if I like them) another for display (loose). With Destro I currently have 7, CC I have 12, and so forth.

I use my extras for various things, CC stands on display in "Tripwire/CC comic-pack" uniform, while each of the other CCs are in the background as different "outfits".

Storm Shadow stands on display in his "legions" uniform (white w/ red markings), while 6 "black" stormshadows stand behind him as his own Cobra unit.

My point is using the various versions or even the same version, for various things. I have 8 "Cobra-Flints", all of them are my Cobra "Tech-troops" (basicly mechanics).