I am wondering how you can judge via an hourly rate. In my line of business, ( not pinball repairs) , if I quoted an hourly rate I would be compared with backyarders with no or little experience with no insurance..blah blah blah. E.g if I charged $140.00 an hour and I completed the job professionally and in less than half the time and stood behind the work I did would you choose me or Uncle Jim armed with an soldering iron and a multimeter? In my experience the fairest way to go is charge a call out fee...e.g $200.00 .This would included travel, initial valuation and even repair if is is a simple one. This also would filter out the time wasters. From there a competent person should be able to give an estimate of further repairs. Anyway ..there is my two bobs worth.