Lotek is right about this. I have a small collection of old mens watches, not worth much if I were to try to sell them, but I like them because their unique with a style not found in todays watches and they don't ever need batteries. So I collect them not for an investment, because it's a bad investment, but for fun. I also have a small coin collection that I started when I was a very young child and finished when I was a older teenager. Again not worth a whole lot more than the face value but it was fun at the time and now represents old times gone by so I keep it for that reason not for making money trying to sell it. These things are more like heirlooms you hand down to your children (hopefully they will take an interest).
The UO8 bike is a classic, but most people will not want an old bike with a possible worn out frame, but to a person who collects old French bikes, this bike could be worth a lot to them. I ride a older bike not because it's a older bike but because it runs very well with never a problem and looks classy, so why get rid of it or replace it with a newer bike? Does this mean that I will never buy a newer bike...no, but it does mean I am not in a rush to do so thus I can make a better more informed decision when I do buy another one.