Jim,
If you are going to rent a room on your own to have a slot card chapter trade session, charging non-chapters members is your perogative. However, if you are using a room paid for by the CC & GTCC you are out of line. The CC & GTCC members have paid for that room. They should not be charged additional to attend a club sponsored trade session. Note: if a CC & GTCC room is used it is club sponsored and part of scheduled convention activities. I will formally protest any such charge to the BOD if this is going to be the chapter policy. You are definetly reducing your chances of adding new members with the additional charge.
Paul