I came on Thu. and staying at the Nai-Yang beach. It is 5 min drive from the airport.
There are two kite shops here and several bars but not to the level of Patong. The bay is about 1kn wide and waters are flat although you can find nice wave if you go deeper to the north (there is a large reef there that is deep enough for kiting.
Cost of living is like other places in Thailand - you can make a good living for $US50.
HOWEVER - NO WIND!
and the forecast doesn't look good. The locals say it is usually windy at this time of the year.
Looking at windfinder weather maps, Zanzibar looks better (actually most of south-east Africa).
That's all for now. Hope to return with better news.
The west side of south Thailand looks good according to the maps but i couldn't find any report of specific kitesurfing locations to go to.