Some icons, like an early CB750 will continue to have value much like certain Mustangs and Camaros.
The CBX is another bike that has gone up in value just due to the elegance and mystique of that beautiful power plant. The modern 6 cylinder bikes just don’t have “it”
I check Craigslist here often and it’s always the same bunch of various v twin ho hum bikes. Seldom anything actually interesting.
I recently sold my Ruckus before I advertised it. The coconut telegraph heard I was thinking about it and I got a call, no problem, it’s a Honda, we want it.
These bikes are desirable, especially stock to near stock. Folks that start cutting frames up are sacrificing value.