Similar question to whether or not to restore a cherry '57 T-Bird, or not. No one would. But, would you restore one that has potential to be beautiful again?
I would never refinish a bow that has a good original finish. Bowdoc's polish does wonders for the little scuffs, etc. But, if a fine old bow has breaches in the finish, holes, deep scratches, lots of stress, I don't enjoy looking at that...and it doesn't bring $ when you sell it either. I've done quite a bit of spot repairs and refinishing that came out fine, but when a really good bow that's pretty much irreplaceable needs to look that way, I send it to bowdoc. This isn't the antique roadshow where someone is going to tell you the item has more value with the "patina" left on it.....and, I wouldn't care if it was. Years ago, I picked up a trashed 57#,1959 Kodiak for $75(actually, a good one was worth more then than they are now!) I almost gave up on it, but there were some differences in the riser colors showing through the mung that was all over it. Had a clue that was sapwood and that it might be a nice one. I sent it to bowdoc and it turned out to be one of the prettiest bows I've EVER had! I have no problem saving a deserving old bow with a first class refinish. It's not a question of reducing the value - you only do it to the special ones that need it! I don't hesitate to pick up a bow done by Donnie...or to pay a good price for it.
I've only kept two Super K's from 30+ years of collecting. Just compared them. One is a 73# that Fred gave to a friend he hunted with in 67, and was basically never used. One is a 60#, 1969 that bowdoc redid some years ago(and it did need it!). They both look new-most couldn't tell the difference. Gotta say, they both have the same value to me.