I personally feel we are at a juncture now where we should not be expecting players to buy multiples of expansions just to get multiples of certain cards.
My feeling are as long as they have 1 original of the card then they should be allowed to use printed versions of the rest. (They must have at least one original of it though)
FFG have made it clear that they will never release a Card Only expansion or sell individual cards so I feel we should be pro-active in seeking "common sense" solutions.
I used to be a stickler for having the expansions to use the cards but now I am very sceptical about it.
As long as they have at least one original and have paid the points for multiples I would be ok with this even in tournaments.
What say Ye?