The Southeastern Browncoats booth is a mix of both, sellers & makers. My husband and I, and one or two other fans, make things to sell. Then we also have Tshirts, decals, that sort of thing.

For me, all of the terms are interchangeable. Dealer, vendor, merchant...We've been known as all three, and it all amounts to the same thing. The only thing you really need know is Dealer Room vs. Exhibitor Hall(s). This is how D*C markets it. And they really are becoming more entwined, with what is sold in each space. Some folk hit only one or the other, but all of the spaces are worth at least a quick look around (or not-so-quick, depending on the crowds). ;-)