unless your buying it for yourself, there won't be too many keen on advertising your store and yeah it will look tacky. plus it would have to fit on every object you sell. the only way you can get away with it is if you can make a symbol that everyone loves then associates it with you - hilfiger, alligator etc are such symbols. and if you hide it - no one will be able to see it, and therefore it's time wasted because a buyer won't see it.
stick with your images and thats it.
---Mike Savad