The concept could possibly work but the items would have to be significantly discounted. For example membership sites like
http://www.theclymb.com/ and others where you get very good discounts for high quality outdoor gear.
I can see myself buying EXCL just to obtain a few items if the price is right. I think you will need a nice marketplace or website to go along with it
How will you convince merchants to sell or accept EXCL ? If I wanted to sell some items what would be my incentive to accept and sell my items exclusively with EXCL ?
*Added question