The hourly rate is only part of the equation. It's about getting value for money.
Some engineers I'd happily pay $100 plus per hour and there's others I'd baulk at paying $25 per hour.
It's what you get for that hours work, productivity wise and experience/expertise wise.
Some guys might be "cheap" but cost you big bucks with poor fault finding and diagnostic skills and unnecessarily replacing parts and overhauling parts or there's others who charging excess time to the job.