Stuff like this is usually motivated by the maximization of property value/tax base. If the (growing numbers of) boomers would rather live (and pay taxes) somewhere else than have their day off spoiled by rampaging shrieklings, this is one way of keeping these folks who were still around for the Fair Pay Days of Yore from moving out and taking their tax dollars elsewhere, leaving their homes to struggling young families whose financial needs are greater and their financial contribution less.

Love, Columbine