I live in Naas and have noticed the same thing and was about to post on this topic! Am originally from a large town in the north and am begining to think I'm at home again with all the helos flying about. In my case, I'd say it is to do with the various golf clubs and race courses roundabout, but then why does the flight path have to be directly over our homes, with these richos disturbing our peace and quiet? The aviation authority it is then.....
As an aside, apparently the old Limo to your wedding isn't good enough anymore, it now has to a helicopter. Soon it'll be a helicopter for the first communion....