Here's another issue for guys like me (I may have said this above somewhere, but I forget....) who are Bashers and Scratch Bashers. Not only are/were we as tempted as most of you by the stock, out-of-the-box desirable locos, we will see many things as simply an assemblage of parts that can be turned into something we really want. So - we buy those too, even though, as is, they hold minimum interest. We get to some/most of these projects, but not all.... I bought a running, PS1 RK PRR 2-10-0 a few years ago. I was buying it for the chassis and maybe the tender. I have a Decapod project in mind....the boiler is useless to me. One day I'll get there.
Then there are the locos that don't run, are incomplete or are damaged - or all 3. I buy some of these, too, if cheap, because my labor will go into them. (I have a fully-functional Weaver Little Joe electric chassis, minus F/R pilot trucks. TMCC, cruise, sound - all work. Runs like a dream. Cheap. One day I'll freelance a body on it.)
So the problem is more complex that some realize.