If you're looking for startup ideas this might help
querycell.com
querycell.com
http://www.m1products.net/sms/manager/images/orderscreen.jpg
How many mechanics have email ? I think a large percentage.
How many people starting up new mechanic businesses are in their 30s or even 20s and reasonably net savvy ? I imagine quite a few.
Course these questions are best answered with some research and discussion with mechanics.
People who have money at stake in some way is probably best.
My 2 cents anyway.
I think google does a pretty good job of providing good incentives. I mean there are a lot of people competing to create content that other people are interested in. That's a lot better than many of the alternatives.
My 2 cents.