He has occasionally played at my club, and from what I know he charges significantly more than local coaches do and only takes on a limited number of students at a time.
Without knowing exact details, I believe he'd be charging for travel costs for overseas players, or his rates are high enough to make it worth his time.
I mean, I know he promotes himself as an Olympian, which is a great feat, no doubt, but I got a feeling that if you weren't at the Olympics, you aren't a good coach.
but on the other hand, I know a handful of great coaches, who brought up some of the greatest players from scratch without attending Olympics as a player themselves ...
for me, a good coach is someone who can create a good player from scratch. like I love to say - from zero to hero. again, I do not want to diminish Hemming, he obviously was a great player, but being a great player doesn't mean you are a good coach. and vice versa. a player who wasn't particularly successful can be a great, successful coach.