In fairness to OHM, the Sound Cylinder line, were a latter attempt to lower production costs enough to continue selling through the "big box" stores (like Fry, ABC, Macy's etc.). Ultimatly, it didn't work, and that's when they pulled all dealer sales, and went with the "direct marketing" approach. Gluing the drivers directly to molded plastic mounts that capped a section of concrete form tubing, & wrapping them in wood grain vinyl (they even offering custom cloth "socks" from your own supplied fabric) were all ways to try and keep making the Walsh design speakers at a price that would work for those big stores while leaving enough margin for the company to survive. Most speaker manufacturers don't look at service 20+ years out on a low/mid level product... ever try and "service" a DCM?
The bottom line is, they were built down to the lowest price Ohm could make them, and still sound good enough to preserve their brand... and I think they succeeded admirably.
As for what Ohm charges, I agree the "trade in allowance", and "Upgrade path" are expensive - I'd even say over priced, but that's a personal call, but their service prices are quite reasonable, and they say right on their website, that they only need both drivers to make sure they are voiced the same... there is no requirement to have both speakers "upgraded", or even serviced, unless they both have problems. Have you ever had a SoundLab speaker serviced? I have, and it's not pretty. They will do anything you want, as long as they agree, and you pay, and cover shipping (both ways), and the parts are still available...
McIntosh are similar, if you're not a "certified McIntosh service facility" you'll have a hard time getting info, let alone parts.
I understand it, but that doesn't mean I have to like it!
PS. Sorry for the run on sentences.
I think I'm getting tired... as Popeye would say "My train of thought got derailed"