I agree prices CAN be to high, but they aren't always:
I've been out with guys who charge £150+ for an afternoon which includes the shot or shots but not the meat. These guys always put me in front of at least one deer so although it's a lot of money I do understand that land of that quality is rare, the stalker must be skilled, and the land cannot be over pressured by lots of stalking.
I've also been out with guys who charge £+ per stalk, plus £50 shot fee... and most of the time I'm lucky to even see a deer - they tell me a 1 deer per 3 stalks ratio is standard. So that means £240 +