Yeah, we need to distinguish between "the better bicycle", and "the more valuable bicycle"; and you might want to toss "the more fun bicycle" and "the preferred bicycle" into the mix as well-- the latter two terms meaning more or less "they way I want the bike to be." . If a bicycle is truly valuable, as is, it's probably not a good idea to try to make it better. If a bicycle is already really good, then it's probably not worthwhile to try to make it more valuable. If you have it the way you want it, then why mess with it?