Thanks John, point taken,
The reason I got caught up in this was chancing on an article for the Meade LX75 10" SN-10 Mak Newt. I suspect this is no longer in production, various reasons are floating around on the web.
While 10" may be stretching the limit for a mass-produced corrector lens, it would be a good performer, which may offset the additional production costs, especially compared to, say, a 10" RC or SCT, which are readily available.
I'm also a little surprised that someone hasn't yet come up with some really creative air cooling systems for closed-tube OTA's to offset that problem.
Don't worry about me, I suspect I'm also a frustrated inventor
