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okay, so yeah, he may not be billing at $300/hr, but he's probably close.
At the end of the day, do you really WANT to make $200 for dicking with it, or not? Decide what it's worth TO YOU and charge it. If they aren't willing to pay, then no big deal.
FWIW, I'd assume he probably called someone else before you and got told the same thing, otherwise he'd probably just call the next guy and ask for a free estimate.