One thing to consider is that when you get a big name coach, you don't always get the service you pay for.
If I'm gonna pay 3600 a year for coaching, I would expect I could get an email returned in 3-4 hours, tops. But the truth is that if you don't already have a name in the game, you may end up as just another client and get one of several cookie cutter programs.
This gets amplified if your coach is an active competitor or is working on their social media presence. You may not be a priority.
I would only really pick a coach who is focused solely on coaching, otherwise youre just giving a man money for very little of their time.