I'm looking at this another way. I see hourly rates as high as $130 an hour her in So Cal. How many hours would it take to do a thorough inspection and then write up a decent report? I'm guessing you could easily spend six hours inspecting the rig and then two more hours to write up a nice summary of the findings. I would not expect to pay $130 an hour. But, I would think if you really wanted a "A" person, he would need to make at least $80 an hour. 8 hours at $80 an hour is $640.
For that $640, I would expect a fairly detailed report on the findings. Not just a bunch of check marks next to boxes indicating that something was looked at.