Heh - Mike's messing with you. While called 'swaps', very little non-cash trading goes on. Vendors (some commercial, others just hobbyists) have tables set up with displays of all types of coral offered for sale. It's a great way to add to your collection at >very< reasonable prices. There is also usually a raffle and door prizes; the items available in those can easily make the whole trip worth it (lighting, RO/DI units, media reactors, and so on).