Well when you can get $30k to buy a new house and developers just keep wacking up their new house prices to match and all these new home buyers have rushed out to buy...what's going to happen when the grants fall back to normal levels or taken away all together? Anyone that was even contemplating buying will have rushed in to get the extra $$$ already so you'll have less buyers, developers will be reducing their prices to build because they will HAVE to to attract buyers, which means negative equity automatically, add in to the mix a couple of rate rises and the odd force and watch the blood spill into the streets.