Quoting Ron White...
"I believe that if life gives you lemons, you should make lemonade... And try to find somebody whose life has given them vodka, and have a party."
Everything is worth buying, at the right price. I define that as being what you are willing to pay for an item...which could range from positive to negative (someone would have to pay you to take it) numbers. There were relatively few 78s manufactured, aren't that many extant, circa 2015, and number of complete bikes is a small subset of that. Anyone horny for a `78 faces some tough challenges. And the K3-`78s are the most costly restoration projects, due the the number of chromed, unobtainium and chromed unobtainium parts.
FWIW, all else the same, I'd rather take one of these bikes with all of the unobtainium pieces present & straight, but with frame damage rather than another specimen with a perfect frame and missing/damaged/roached-out unobtainium. Which would be easier: replacing rear turn signals, front turn signals, headlight ears, late-model handlebars + switches, speedo, etc...or...finding another `78 frame? IMO, that's an upside of a non-titled bike. IMV, it's a question of maybe one (major) part vs multiple unobtainium bits. Not a great choice, perhaps, just the lesser of two painful scenarios.
Thus, it's really a question of the appropriate price. If the seller is a flimflam artist, walk away; it's not like he's pointing a gun to anybody's head to buy this bike. If the seller is simply ignorant about CT70 restoration/resale (not everyone is an expert), then it might be worth negotiating.
Best case, there's only a superficial (and easily repairable) dent in the frame, the bike runs like a top, is complete except as noted, the unobtainium pieces are straight and mostly in good shape, it might have a market value in the high 3-digits. OTOH, if the motor is clapped-out, the chrome is all toast, the headlight ears need repair, etc, then there's maybe $375+/-$75. I wouldn't go more than $350 without seeing the bike firsthand...
