You could look at another way however, by selling products at a discount. (and it is actually not a discount because there is no middleman to be making money, you are selling directly to the gamer) Every product you sell at a con is an add. the gamer will go home and tell his friend what a great game it is and you will sell 10 more at the local store. Perhaps I am missing something but I would almost give products away at cons in hope that this would happen. Obviously the most rabid fans are at gen con and they are the best advertising you could buy.