Because these sorts of developments are typically trying to fill the trailer park or retirement community niches without incurring the negative baggage that comes with either.
>Both of those have kids around more often than you'd think,
I might know that. You might know that. But does the average yuppie DINK who is looking to move out of the city and into one of these developments know that? These seem to be positioned as the suburban equivalent of luxury condos and targeting the same demographics with their messaging.