I wouldn't book her on the grounds that to get a decent hourly rate you need to book for four hours. Law of diminishing returns and all that - some of you guys must be mad. What else would that buy???
Totally understand your perspective tcm. I wish her rates were lower and more in accord with other quality WGs, then again I wish that more WGs had her talents, attitude, and approach. Paradoxically I would probably see her more often (with bigger overall spend) if her fees were less, but as it is she's an occasional treat. Although maybe not as I enjoy variety.
I'm bemused by the ways that many folks spend their money eg smokers spending £250+ per month on a habit with its many detriments. However if someone earns their money in honest graft then I have nothing to say on how they spend it.