A funny WebmasterWorld thread named house has forum members discussing the type of home they have purchased from their Google AdSense income, if they have purchased a home at all with it.
Many just use a portion of the AdSense income towards their mortgage or rent payments. Some were successful enough to pay off their entire mortgage outright. Some earned enough to by a prestigious home for their birds. Some don't use it towards their home, but rather use it towards their business, to generate more long term income with AdSense (and then possibly use it towards a house then).
Forum discussion at WebmasterWorld.