No, I would like to think that a master mechanic's job might not be as simply as changing fluids, brake pads or diagnosing engine fault codes. Imagine doing engine repair or changing the clutch on your driveway without a lift? It would take many times as long for the mechanic to finish and he would rather just take 3 separate jobs in that same span of time.
Yes, the idea of the startup has its merit, but like the windshield repair service that was mentioned earlier, the services offered by the mechanics will probably only include the most basic of repairs.
with lifts and the right equipment a master mechanic could change oil in 5 minutes. without it, 20-30minutes of lifting up cars and manually disposing of the waste.
Backgyard mechanic = some guy who just modified the default theme on a WP blog and now thinks he's a programmer.
The difference in skill level between a master mechanic and pretty much everyone else is the difference between a rockstar programmer...and every one else.