Random Madness
I can't bring myself to buy those damnable randomized packs of plastics. I'll only buy mine from those stores good/smart enough to open up scads of packs and sell the figures individually (and trade people for the rares). I think it may be slightly more per figure on paper, but at least I'm not stuck with figures I'll never use because I have metals already, don't see the point of owning, or are just so terrible-looking that I would never consider displaying them in public. When you factor that in, I think it works out about the same. And besides I like to support my FLGS for such enterprising practises too.
I may buy some Star Wars packs at the beginning though (until I think the repeat-factor is likely to get bad), just because I'm a SW fanatic and will have to try and get a complete set for my collection ... plus the packaging for display. (Lucas has me by the throat I'm sorry to say.) But I tend to consider that the exception....