I can't speak for everyone but I wouldn't apply that kind of pricing structure to someone who couldn't afford it or wouldn't get any value from it.
I'm an accountant and tax consultant.
Suppose a client contacted me, they're semi-retired with very little income, they need to resolve some business affairs from years ago in order to collect a pension or whatever. I'm going to tell them the hackiest workaround to achieve their goal, and tell them how to do it themselves, hopefully without really having to charge them even for the consult.
On the other hand if someone wants to sell their family farm for several million dollars and wants to know the tax ramifications, they're going to get the "particularly complex area" pricing, full written report, and so on and so forth.