Jim trades people skills for technical acumen. He occupies a very narrow niche in the industry, not served by anyone else. How many other companies let homebuilders build their own aircraft electronics? Radios, NAV/COMs, marker beacon receivers and audio panels and antennae are indeed useful, and he's forgotten more about the systems than most of us will ever know. That said, I've met him enough times to think he's real good people, and deserves patience in business.
He's probably sick and tired of people asking for handouts, like Drew mentioned. He used to write awesome articles about the things he sells. The website still has schematics (and sometimes PCB layouts) for the previous version of a lot of the things they sell/sold, including the old COM and NAV/COM radio kits. I think a lot of folks expect something for nothing now, and he's still trying to make some scratch from the business.
That said, in my nearly 20 years(!) of on and off dealings with him and RST, I've never been let down. Be patient, it's mostly him and a helper in his garage if I understand correctly.