and the really great ones look good when you saw them in half and then see how well the bronze or silver has flowed into all the places you don't see from outside. Not that I'd recommend you do that to a good frame. Along those lines, it's often pointed out that a certain frame builder had mitered the tubes in the BB shell, meaning they are cut to fit together cleanly and follow the contours of the shells interior. This isn't necessarily going to make the frame stronger or ride better (tho it might make installing the BB easier) but it displays a high level of craftsmanship: even if a buyer never sees this detail (or can appreciate it) the builder knows what good practice is and doesn't cut corners, he takes pride in his fine work.
You pay for that.