Well, that's the whole thing about parting out a bike. My 1950 Norman Rapide set me back $100, and attached to it, as you can see in this picture, was a light similar to the one in the auction.

I would gladly have paid more than that for the bike without the light, but there was no reason to mention that to the seller. As it turns out there are quite a few things on that bike that would sell for more than I paid for it; it doesn't mean the lamp (for example) isn't worth it, but rather that I got a pretty good deal.