I do think there's a challenge in that... as a developer, paying $58 for half an hour that may save me 8 hours is a no-brainer, but this feels like a difficult thing to ask "the boss" to pay for. It gives off Fiverr vibes, and usually there's much more ceremony around billing contractors/consultants.
But if you pitch this to big business needing big support (a context in which this feels like a stupidly good deal), it may also drive up the price by changing the expectation from the ringers as to what they are providing.
I'm rambling, I know... I wish you luck. I'm definitely watching this space. It seems like you've found a definite potential market, but I think it's going to be hard to capture it.