It does seem rather steep for 90 minutes, but there are some hobbyists that have no issue paying that kind of money ! I'm with you John, I'm not one of them. I do wish her well, but would rather share the wealth with some of our quality providers.
To be fair it says that those are NYC rates and they are different when she travels. At 900 for 3 hours she is $300 an hour which is still pretty steep for this market.
She was looking for prebooking so I'm wondering if that was a fishing trip and whether she actually made the trip at all.