[WhompingWindows]

Noise may be a factor in certain locales with decent human-centered regulation against it, but:

A) rich people have a ton of power, they will get it legalized if they really want to use them

B) There are many sparsely populated areas where rich people would still be able to make this work...think rural islands of Japan or New Zealand, very mountainous areas, the outskirts of a major metropolitan area...I think these will find use in certain markets.