It's a nice gesture but hardly solves a problem. If the payment is for a mechanic to perform some "service" on your bicycle to make it roadworthy again, and from it you gain neither the tools nor the knowledge to perform two simple, necessary tasks for a cyclist; replace a tyre/inner tube, or replace a chain; what's the long term benefit?

How about put 50 euros per cyclist into a tool kit, a dozen inner tubes and some education (YouTube videos even?) so they can continue to cycle long after the 50 euro one time service has passed?