I talked with an ex-ROA owner recently who said that he sold it because it was time consuming to load a BP revolver, and cleaning it was a chore. But he also said that he enjoyed shooting it except for those factors and that he did miss it, but that at the time, he had other guns that he enjoyed shooting more. And he said that he thought that it was the best BP revolver made.
I believe that you're right that the Rugers are resold more often because they are worth more at resale, and that the older imported revolver models usually aren't as well made and valuable. Plus, Ruger often refurbishes their used models without charge. So the used ROA's maintain their value vs. paying the increased cost of a new one. So if it's not being used much, there's a greater incentive for the ROA owner to sell it.