I totally agree that we need to be more responsible when kiting, but as jkeys says what do you do and how far do you go in being responsible?
Is it a case of just mentioning something to someone or do you pack up your kit and go home, because somebody else decides that they want to swim right where you are kiting?
I was down at Pinnaroo yesterday, I had my kite all setup and was ready to do a self launch (launching towards the ocean), when a couple of ladies came wandering down the beach. They were downwind of me, so I waited till they had walked further upwind along the beach. I then set my kite up ready to launch and walked back to my bar. The two ladies then strolled back down the beach and stood about 5m downwind of my kite to watch.
I had to go over to them and explain that it was a dangerous place to stand and could they move. They were okay about it, but I have this worry that (just as jkeys found out) some people are going to go off on one and start proclaiming the beach is theirs.
The general public need to use a bit of common sense as well and take some responsiblity. If there was a sign up saying "sharks frequent this area", how many people would actually go in and swim?
I think the idea of the signs is a good one and I've seen a few along some of the northern beaches warning about windsurfers.
There is so much space in Perth, everyone can have their own area. Pinnaroo is a well known kiting and windsurfing spot, even the Whitfords sailing club use it at the weekend. Either side of this point is loads of kms of beach. To mark off a 500m stretch as a kite surfing area wouldn't inconvience anyone. And I'm not suggesting that nobody can go in this area, it merely has a sign that states that kitesurfers use this area. The same as they do for animal excersise areas. If you don't want to get dog ** between your toes you won't got sunbathing on that area of beach!

As has already been suggested, could this be something that WAKSA could push harder. The pro-active stance is a good one. Maybe as kiters we have to accept that there should only be designated areas where we can kite, but surely this is better than having a total blanket ban, which I honestly believe could happen sooner than we think.
BTW Hi to everyone here, I've been reading the forum for a while now, but this is the first time I've posted.