[cawlin]

People seem motivated to keep their bikes maintained if they don't have to pay for it themselves from my experience.

In Canada I've volunteered at free bike tune up stations for many years, they are usually set up at popular summer events or at community centres.

We get a lot of people who aren't confident enough to do basic things like adjust brakes, gears or even change a flat tire. Most of the time they've simply rode their bike and dealt with poor performance or issues until it becomes a problem or they feel it is unsafe to ride.

For these folks getting someone to do extremely basic yearly maintenance would keep them happily riding for a long time.