I'm new to deck construction and have but 4 or 5 of the entire expansion range. As I peruse everyone's deck builds, I seem to notice multiple copies of single cards that don't appear in threes in the expansions. Do most of buy multiple copies of the same expansion?

Not yet. But I don't play competitively.

I have a small group that buys multiple copies and shares according to each person's favorite faction(s).

I only buy one of each pack. I don't see it as worth it to buy extras for the rare's and end up with more commons than I need.

Sadly for my wallet, I do buy multiples. Not only for me but for my GF as well.

Not so bad now that Asylum packs have 3 of each card in each pack.

Even though its pricey, I still think it is worth it due to having a live in card player.

It kind of depends on if there is a particular card(s) that I want more copies of in a specific deck. I think that eventually I will have 3x copies of each deck, but that will be way down the road.

Thanks for the replies