alasta:
Yes, although residential property is generally a leveraged investment, so people are getting returns on the full value of the house rather than just their equity. The problem with leveraged investments is that you're assuming that your return exceeds the cost of debt (i.e. mortgage rate) which is probably true in the current environment but, again, not sustainable over the long term.
Very true. I believe you can also borrow to invest in the sharemarket, but I doubt too many casual investors/savers do, and banks probably aren't all that keen on lending either, as they probably see it has far higher risk than property. eg. if they lend on a house, banks can always sell the house to get their money back, as long as they didn't lend more than the house is worth. That however is potentially a problem in a property bubble...