Odds of Hanging On
A part-time worker who sticks around of their own volition for ten years or more at nine dollars per hour is an employer's dream, but sadly that just doesn't happen all that often. When you examine your odds of hanging on, you need to look at them from your side of the putting green, not the course manager's.
Can you afford to stick around making that little capital for an extended period of time? Do you want to? If the answer to both of those is "yes," then your wish can become reality. You're going to have no trouble staying employed as a greenskeeper for as long as you want the job.