Most if my products have been directly related to demand. I started off offering embossed single and double layer belts, and doing repairs, but since then have branched to some adult stuff, holsters, bags and all sorts of other things. Lots of times they are a one off product but it gives me experience and makes them happy. Particularly the left handed crowd which I have specifically marketed to over the years.
Right now though I have had to turn down several orders, because I am just not set up for the items they want (lack of blue guns and whatnot), it is those times where I send them off to other local people who I know can do better work and make them happy. Historically my customers remember that and check with me for future orders first.
Price point is complicated at times like that. People come to me because I am cheap, and I generally work out deals where they will just pay for the materials in exchange for product testing and a review. That way my development is at least partially covered, without going into the hole with unhappy customers, or simply lost materials.