I was out there again yesterday for a few hours and had no problems with anyone deliberatly dropping in.
One thing that does get a bit frustrating is when heading out I was usually a heap further up wind and when turning for a wave that had no one on it I often found that a poley would then turn for the same wave that I was already on.
I honestly think they were that far downwind they hadn't usually seen me at the time and by the time they do they think that it is there wave because they had been on it for a while, I usually just let them have it because it is so easy to gybe and grab the next one. (and I feel sorry for them

)
However often there is already someone on the next one so you end up hanging around waiting for a while for one without anyone on it.
Also I did have to straighten out or hold back a top turn occasionally when on a wave to dodge the odd poley jumping on the way out, I can live with this (haven't got much choice when you are the only kiter with a dozen poley's), but I believe it is a dangerous practice and can't help wondering if it would happen as much if I was on a pole board.
I personally believe at a spot like that anyone on a wave should have right of way.