Sean - Average green fee revenues in the UK is a difficult subject really. It depends if the club has 500 members and space to sell or 800 members and not so much space or 1000 members and no space. An average full member plays 40 times, 40,000 rounds per annum is a pretty busy golf course in the UK. I think the range would be sort of zero to £1,000,000 but I would imagine a lot of clubs do less than £100,000.
I think with Admin costs, it depends what you call admin. Where do you put the rates, what if a club pays rent, is the secretary,manager admin or his he/she golf. Admin costs are much more than 15% to us, probably closer to 30%, but that could be just the way someone accounts differently.
Its not lots of money to groom and maintain the golf course if you take the wages out in the UK, we dont feed or water or use chemicals anything like some areas of the world. I suspect most monies are lost in the clubhouse and it will often be the food that loses as opposed to the bar that makes, every club and situation is pretty different though.