Earlier quoted context omitted.
Hot housing markets are extremely high risk high reward investments. Buying NYC real estate for example, it is practically impossible to use a traditional "buy and hold" strategy and have the rents cover the cost of investment (typically rent covers more like 50% of operating costs in NYC). You pretty much only make money in NYC REI via speculation (ie the property goes up in value) not from paying down the mortgage…
Last I heard, NYC is literally running out of pavement space for pedestrians, let alone vehicles, and increasing the supply of housing still hasn't brought prices down.
https://www.nytimes.com/interactive/2016/05/19/upshot/forty-...