See, now I'm on the opposite side of the fence.
I have a cart that's doing almost $100K a month in sales; and there are a couple of bugs that I need fixed, because I'm tired of apologizing to my customers because their pricing isn't right. Now, out of the blue, the cart has begun informing everyone who tries to check out without logging in that the User Account already exists. I have other customers who have figured out how to "Cheat" to get discounts.
Personally, I feel that fixing the show-stoppers is much more important than new functionality.