The old drum sanders such as mine do not seem to be highly valued. I was given mine, for example, when I bought a couple of other machines from the same shop. A three drum Solem (I think) owned by a friend was passed by at the uaction after his death (he, like me had learned on the Solem I now own, and he had replaced it with a Timesaver, if I recall correctly).
I suppose these are not liked because 1), the paper/cloth changes are difficult, 2), becasue lubrication can be difficult (though mine has a one point oil system on it that does most of the work), because they are heavy (but thy're not that heavy really and to a certain extent that should be thought a plus, and 4), because they use a lot of electricity. Adjustment is not hard, most maintenenace is not hard, and they can be accurate--I believe mine is/was, though all machines have a practical life span and these things were made to run several shifts per day, all day everyday: that was their original point. They sand well enough.
There are a few shops that like these for some reason better than wide belt machines but in general this is not nearly the case. In my experience they bring no money for resale, no--or as in my case--little interest from 'collectors' and 'tinkerers.'
On the other hand I have a Performax in my little hobby shop and--while it's a cheap little light thing--I like it well enough and use it a fair amount (and wish I had two so I could set it up for two different papers): it's definitely better than no sander of this type.
