I've done it. And usually when I do, I've gotten lucky. I've bought stuff because it was attached to other stuff I wanted, and it turned out to be a bargain - diamonds in the rough as it were. So I usually keep the stuff. That's what happened to me with my Cooke Series II 10.5" lens. I bought it because it was bundled with a big, early Voigtlander. It looked in rough shape (it was, but not as bad as it looked in the auction listing photos). Turned out that both were absolute bargains. The Cooke has cleaned up nicely, and although it has some pretty big scratches on the front element, it will be useable (it's a soft-focus lens anyway!!!).