Luna Moth questions

I have lived in Kennebunk, ME, for almost three years. Before that I had lived in Dedham, ME, where I saw many luna moths and other interesting insects. I have not seen any luna moths (or any silk moths or sphinxes for that matter) near my house. But in Wells, the next town over, I have found many different saturnids and sphingids at store lights: luna moth, polyphemus moth, apple sphinx, rosy maple moth, pawpaw sphinx moth,even hummingbird moth (that's another question: why would a hummingbird moth be at a light?). This does not make any sense to me because I have all the right food plants on my property, and Wells is more populated and filled with humans then Kennebunk. Does it have something to do with pesticides? I thought salt air from the ocean, but Wells is just as close as Kennebunk to the Atlantic. Why? Why? Why??? I hope that there is an explanation for this strange event.