The difference between a 300,000 dollar townhome and a 600,000 dollar townhome on the other side would be its a hell of a lot cheaper and easier to dig in the 300,000 dolaar ones yard. To boot the 300,000 dollar one will probably order more services.
Not necessarily. In NJ it's weird. I know one guy who couldn't get FiOS even though across the street had it. It had to do with street boundaries.