Camilo

I dont' think anyone said it is. But do you not agree that many, if not most cyclists, even very enthusiastic ones who ride a lot at a fairly high level, have not desire to do this stuff, have no knowledge how to do it, and might not even have the aptitude to do it. Heck, playing a piano isn't rocket science, but not everyone wants to or even can do it decently if they try.

This group is a very, very biased sample of cyclists and has an unrepresentative proportion of folks who want to and can do bike mechanics. And even here, there's a lot of folks who do not do any of their own work, do not want to, and probably wouldn't be good at it anyway due to lack of interest or basic mechanical experience or aptitude.