Exactly. A person isn't going to be able to sell DIY quality parts to a bunch of DIYers and expect to make money.I am reading posts laced with bad attitudes or at the least tender egos across a couple of threads. Maybe its seasonal affective disorder, ISIS, or the recent announcement of the supremacy of the Chinese economy. Despite his moronic politics... "Don't worry, be happy". This is all supposed to be fun and can be. I build mounts like Pat's all the time. I do it, not because it's so easy, but because I want the design to be tweaked for each application. If you have the mill and some basic tooling it is not hard and the designing is fun, but it is not at all cost effective unless you're unemployed. You can buy the ball screw/ bushing sets for around $5-$15 each (x3) although I have more often dealt with the coarser 3 x 0.5mm cone head set screws by using long lever arms. The ball screws are a pleasure to use, however as well as more expensive. A neat trick to set these up is to drill and tap the three screw holes and then securely clamp the little mirror-supporting plate against the base. Then, with hard steel (not the final stainless ball or cone tip screws) drive the point about one turn into the soft aluminum plate for a resulting perfect alignment. The indentation provides the receiver for the final screw. Then instal the spring (s).
I tried that once and it didn't work out, but the industry wasn't ungrateful. It just didn't make financial sense for me and, so I learned from it. I don't think the industry was ungrateful for your mounts (generally), they miss them, but it isn't feasible for you to serve that market. You obviously have the skill. What about providing much more expensive, one off mounts for individuals on a custom basis? Not everyone has or want's a mill. And for some, the quality/custom route is worth enough to them to make it worth it for you.