Earlier quoted context omitted.
You expect a high speed train station outside your front door? Awfully optimistic of you.
Little need for high speed rail when you’re talking about daily commuting. Personally may last five apartments have all been in short as in under five minute walking distance of a subway, that’s the advantage of living in high density areas.
Cost of living drops off as you leave metro areas. Like another responder to your comment noted: people pay for convenience. I'd say cost is a disadvantage of living in a high-density area.