I also believe that inquiries should be answered as quickly as possible. I'll do my best to answer as soon as I've read the question if it is a simple enough answer, or within the same day at the latest.

I've emailed a few vendors with questions or comments about their products, and for the most part have had good experiences with friendly and fast informative replies. There have been a couple though, that never answered at all...one that didn't reply after two inquiries I made about a product I really wanted. Did I buy it anyway? Not a chance...if the merchant can't be bothered to answer what I as a customer feel is a serious inquiry, not only will I not by the product in question, but I won't buy anything else from their store either.

Other than that....I know it's been said a million times, but a better search would do wonders. It is frustrating to no end to try to make a search specific and get page after page of listings that have nothing at all to do with the search criteria.