Maybe his neighbors will be happy that it ceases. While I don’t live on an airpark, I would like to live on one and if I did I would be more than willing to accept the noise generated by normal operations such as aircraft taking off, landing, and flying in the pattern. I however would be very intolerant of a helicopter operating in the manner described. As to no one waving at him, I’d probably wave him over to my hangar and hand him an ice cold beer if he got the nonsense stopped. As to how the FSDO would handle it, don’t be too certain of your theory on it.