In most cases, I like seeing original cabinets left original. Some touch up is ok if it is reasonably well done. I remember a collector a few years ago who found a sample game "Kings & Queens" with a very nice original cabinet. Being a perfectionist though, he had the cabinet repainted. Although it was done by one of the very best restoration guys on the planet, and it looked great when it was done, to me the game's value was diminished greatly. The same for a mint "Foto Finish" that was shopped by a well-known person in the hobby. For some reason, he replaced many of the original coils. The originals were perfectly good, but they were needlessly replaced with new ones with the plastic bases. To me, that ruined the value of the game. It should have been left all original. That's just me though. Of course repainting a trashed cabinet is preferable to leaving it original. I just don't like seeing a reasonably good cabinet getting a full repaint even if it is done well.

I agree. Many collectable items are much more valuable if left original. Any restoration or even cleaning (such as coins)
will greatly reduce the value.
Pins are a little different in that regard because most games aren't truly "collectable".

It's just me I guess, but somehow repainted Williams games don't bother me as much as repainted Gottliebs!