There is a lot of elitism on this thread. Seriously, it is up to the cyclist whether they are comfortable fettling, filtering or fixing their bike. They are not 'bike users' because they struggle with mechs, they are cyclists because they ride an effing bike.
I know mechanics who struggle with the modern car let alone the driver without a computer degree and anyone who attacks other people's busy lives as being lazy are either unemployed, retired or really lucky with their work/life balance.
And I have yet to meet an LBS owner who objects to earning some money fixing someone's cable problems.
Anyone who decides to jump on a bike, whether a £100 quid beat-me-up or a £1000 show vehicle should be applauded whether their hands get greasy or not.
Actually I called this elitist, as a geek I know I'm wrong. This is nerdish behaviour.