Everyone who does sales of any kind does this to some degree, and con vendors are no exception. There's a statistic that, on average, 1 in 10 people will stop at your table, and 1 in 10 of those people will actually buy something. So trying to draw more people, and the right people, becomes very important.
All three of these instances are also real considerations. Cosplayers often go through the Artist Alley to shop and come back later when they're not in costume to buy. Fellow vendors are trying to make money and therefore less likely to be spending it. And furries ... well, con vendors love furries.
Rock on, guys, and never stop drawing.