BTW putting my 2 cents in.
I have only occassionally kited the Pond, its too ego-filled for my cruising style, but it is not elitist to have beginners avoid kiting there.
It is primarily a safety issue for the onshore/downwind geography- if you are not able to control your kite 99% of the time, you are risking the safety of yourself, other water users, general public and local residents.
This doesnt apply to windsurfers as out of control beginner rigs dont float downwind in the air (generally

).
I cant comment on the mucking up of the circuit and freestyle heros tricks because I havent kited there when there was more than 5 of us in total