I've been thinking about this, and while I think nostalgia/sentimentality has us pining for old and vintage instruments I wonder how much of it has to do with practicality. Probably a lot of junk was made back then too... I just don't think the crap or average basses lasted long due to necks warping and people getting rid of the garbage they didn't want to mess with.
Those rare basses where everything came together perfectly -- well behaved necks, perfect joints, etc -- probably were appreciated more, modded less, less likely to be sold, etc.
Agreed; IMO some of the best basses or guitars have the most warn finishes because they were good and played by working musicians.
As with any high production item made of wood; there are winners and junk be it instruments or furniture.
I think many like the Pre-CBS instruments because:
* It's cool to own an old instrument
* Possibly some connection with old and worn identified by the player. I once played with a guitar player that had a real, clean, old Strat. He was very proud of it and suggested that was what made him a good player. The rest of the guys on the session didn't think it mattered at all since he wasn't that good.
* Many PRE-CBS were from older growth wood and were very dry
* All in all, I think the older are lighter in weight
* The worn nitro on the back of the neck feels good; not long ago there was no nitro or non-gloss poly for neck finishes.
* Don't discount how the 70's poly finishes age. I have a 73' Olypic white that is really yellowed and brown.
Also have a 72' sunburst that has checking and faded finishes
As stated above, they made winners and loosers along the way.