I certainly do not mind going out of my way to help or answer any questions at anytime. In fact, it would be difficult to find someone that I didn't answer promptly or provide with extra pictures, etc. I think your response to an inquiry is highly indicative of your business character traits. I've gotten many questions about an item with no interest in purchasing, generally in the (Do you have extra parts, what color is something etc) I will always answer those questions. You never know, he may want to buy something from you later on.
What does bother me though, is when I am called at suppertime and actually answer my phone for a potential sale. Spend a little talking about it, striking a deal, go out of my way the next morning, then to be treated as if I am BOTHERING him when I do as HE requested by calling back in the a.m. with a total cost. Well sir, that kind of person can kiss my ass, I don't do folks that way and expect not to be done that way in return.
I think the thread is content is being lost with some of the comments about asking questions, quality of the product, etc.
The original post was about striking a deal, then not following through on your end, not about quality or answering questions.
Just my thoughts my friends.