There is no loss of opportunity. You can borrow against invested money at very low interest rates, lower than mortgage interest rates, and people often do. In t

There is no loss of opportunity. You can borrow against invested money at very low interest rates, lower than mortgage interest rates, and people often do. In today's crazy real estate market, when people make "all cash offers" that is often just cash borrowed against securities. It is some of the cheapest debt that exists.