I do it because it is cheaper than therapy, and it is my therapy. To take something old, discarded, cast-off, left for dead and make it work again is a great feeling. To see the smile on peoples faces when I either give them a bike, or give them back their bike done over is well worth it. I could never do this for a living because I wouldn't ever be able to charge enough to justify it, and I really feel it would take the fun out of it.
I'm a car guy at heart but 2 divorces have left me will little or no resources to enjoy that hobby. Bikes can be brought back to life for sometimes nothing, yet made serviceble again and look as good as the eye of the beholder sees fit.
I enjoy riding bikes, and have for all of my years. Growing up, I always had an old hand me down bike until my 12th birthday. My parents scrimped and saved to by me a 1967 Huffy Rail. It was my pride and joy.....until it "disappeared" much to my dismay. I was bikeless for a few years until I was able to buy my own bike, a new 1971 Murray steel diamond frame road bike which I still have to this day. And I think this is why I have so many bikes now.....because I can!
As I'm sure most everyone on this site will agree.....don't think you'll start doing one bike and that will be it....ha ha ha!!! These bikes are worse than illegal drugs! I can't get enough of them....ever.
It is fun, inexpensive, enjoyable, limited only by ones willingness to try new things, and at times the monthly budget, but always, always fun.
The group I ride with once a month from my local friendly bike shop is such a mix of people from all walks of lfe and financial status, but when we ride, no matter what the type of bike, we are all one. And you don't find this type of comaraderie in many other venues.
See my tag line....I'm a bicycle addict!