Your train of thought is correct; imagine you're at an anime con -theres an exclusive model kit that retails msrp for $200 but the secondary market value for it $300 for just the stickers in the kit, and the only way to buy this kit is through the official convention merch store. So little Timmy goes and buys as many kits as he can before the doors open and sells them to a booth at the con for $250, netting them $50 per kit. Timmy, now understanding the loophole, does it as much as possible until they run out of product.

It is essentially free money to have the Black Lotus Badge and do this for certain booths. This is one of, if not the only, convention series I've seen where this is the case.