Why do Card Shows SELL cards and not SHOW cards?

[CW]

I wonder what would happen if I rented a table at the next Card Show in my area just for the purpose of showing a part of my collection, meeting other collectors and asking them if they wanted to start a collectors club. When I brought up this idea to the owner of a local Card Shop (who also rents a table at Card Shows) he said that the dealers at the Card Show would not like this. It seems to me that anything that would bring more people to the Card Show would be good for the dealers.

I could see how the other dealers at the show would not like this as they would think this would take away from sales, since people would come in and trade, more than they would buy.

I can see the positives for this, though, and I think you have a great idea.

Sometimes a local library might have a few display cases where they will temporarily house the local residents' collections for viewing. This is the only thing I've seen where you could simply show your cards for others to see and enjoy.