Almost every bike I buy is because of 1 or 2 parts in the end, a Brooks will seal the deal almost every time, headsets too as they are often beat up or a bit hammered, a Campy Record, NR with good chrome and corners can and will often do it. The more chrome that looks bad but also looks to me like it will clean up well will do it. Campy SP binder bolt in good shape can do it, we know how many of them bite the dust. If the bike in question has a frame I want, everything else can be a bonus, especially if the bike is a bargain.
Lots of other scenarios as well and yes several bikes have been bought because they were cheap enough for the one cool part that I wanted.
