Is it really necessary to have more than 1?

BigDogBill1360 said:

There are multiple threads on this topic over at boardgamegeek - here are four of them (I believe there are 6+ threads so far over there):

• How crucial is it to get the second core set
• Purchasing quantities
• Not 4X of each card
• Any real reason to get 2 core sets

….sigh….