Now if you can get a tech to assess the piano for $30 why are even inquiring further.
Because in many cases, especially when it comes to piano tuning, inspections etc., you get what you pay for.
I wouldn't even consider looking at it and giving a verbal suggestion for that price, it isn't worth my time. But on the other hand, phone advise is totally free.
A lot will depend on how much detail you want in the inspection. If you want someone to just give it a quick look-see they could very well miss something important like a split pin block or loose tuning pins. If they have no idea what they're doing, you're likely screwed either way.
I have an inspection list that I go through, a written one so that I don't forget something. It takes me at least a good 1/2 hour to check it out but, by the time I'm finished with the report, answering the customers questions etc., I've spent at least one hour. Quite often more. I can tune a piano in that same amount of time. Therefore, I charge a minimum of my tuning fee for an inspection.