In financial speak, leverage is always the source of ruin especially when taken to extreme levels (which mortgages do). To attain that leverage, you pay a fina

In financial speak, leverage is always the source of ruin especially when taken to extreme levels (which mortgages do). To attain that leverage, you pay a financial cost in terms of interest which btw - can be replicated in the market for much better returns and if you know your math and derivatives - for a much lower cost of capital (equity options and index futures) in a market that is highly liquid with transaction fees as low as single digit dollars.