I don't see a problem with his fee.
First, if he is in a 25% tax bracket that $400 just became $300. I work in the IT field and it is common for consultants with a specific skill set can get $250 to $300 per hour.
I would assume that he just does not go into his Skype call cold. There is more than likely some amount of time spent to get background from the family, and likely a follow up call.
I was a juror recently and it came out in the trial that a Dr. who gave a deposition charged $750 per hour for his time because it was taking him away from his practice where he earned his living.
I would have much more concern if Hassan wanted to sell a course or program that could drain a person financially over a longer period of time. i.e. fortune tellers, Scientology etc.