I have not sold cards in sets, but have sold coasters in sets. It seems people would rather they match exactly then get an assortment (for example of different lighthouses).
It seems like it would be more cost effective to make matching sets...but I do not think I would buy 4 of the same birthday card. I would buy four of the same notecard or thinking of you card. Just a personal opinion!
Don't know if that was any help.
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