I agree with you about not finding many new keys in most Whirlwind RR's and postage is expensive. I too have had similar experiences on occassion. It all depends upon who is on the list BEFORE you. When Jim Silva was active, I looked forward to receiving the RR's from him. Esther is another good source for new material. They always had new stuff. As new RR's are organized, hopefully some new participants with new material sign up.

Trouble is with one-on-one trades outside of RR's, it's tough to find anything for Jim Silva in exchange, as he already had the same keys I was offering to trade. With the RR's one can usually find variations by having so many keys in front of you to examine one at a time at your leisure.

As for your claim not getting any response to your wants on the message board, I did a search on your requests over the past two months and it would appear that you have been quite successful finding material that you need to maintain your interest.
http://www.slotcardbbs.com/index.cgi/md/index

Then, the collectors of BLANK only cards are faced with entirely different logistics. Many casinos simply will not give out blank cards.

Don't give up collecting so easily Michael. Some cards/keys ... (just like chips) ... you will never obtain. They just don't exist in large quantities, or they are from a geographical area that not many collectors are from or frequent. The costs associated with getting these cards prohibit them from being offered for $1 or $2 each.