[davidmanze]

If a lens is outdated and cheap, then it's probably

• broken
  
• very old
  
• with fungus inside
  
• damaged and the damage is hidden (decentered, automatic diaphragm doesn't work properly anymore)
  
• with a mount not fitting to any current camera body
  
• part of a heritage when the heir doesn't know about the value
  
• difficult to focus manually with a modern DSLR, less difficult with mirrorless
  
• difficult to get spareparts, if you forehand manage to find a repairer. (See Toni-A's cable problem)
  

Everything is just good for the adventurous types saving tons of money in getting a collection of lenses nobody has because nobody wants them [/irony]. In that case, "outdated" to me really meant a thing you need to tear apart bit by bit and clean and eventually fix it and put it back together. The other lenses like the Mark I types when there's a Mark II still have their prices and cost a bit more than a song. Probably there are some outdated lenses around which still are a jewel (and their owners mostly know about), but the cheap majority is mass production. I don't want to get a Revuenon, old Sigma, old Tokina, battered Vivitar and what their names were, they were third best choice at their time and today 5 € is too much for them to pay.

 You certainly see the bright side of the S/H market JoJu.......

 

It's certain that some will  be broken...I have bought a couple of those......I have however returned them.......... actually never had a fungused one (just luck)........... lenses needing spares tend to be modern ones (focus motors and VR units) and the price of spares usually is as much as the lens is worth, as in my AF-S 70-300mm Nikor, they want 300€ + postage for a new VR unit, I could buy another for less!..........decentered lenses seem most common new.....but it's true that you can return them.

 

......But how you knew that I have a Revuenon MF lens up for sale I don't know!... 28mm F2.8, all metal and as perfect as new......

 

 Even my next sort after lens can now be found S/H, the Sigma 150-600mm sport....let's hope it doesn't turn

 

out to be like one on your list........