The result of that idea is Realius, a San Francisco Bay Area start-up that this week will start rolling out a series of online real-estate fantasy games. In Price Me Now, users can guess the asking prices of homes for sale, then see their accuracy ranking. Major League Investor lets them assemble property portfolios to make imaginary profits. And Fantasy Flip urges housing addicts to upload photos of their own homes and solicit guesses of how much an improvement will increase their value.

With home prices slumping nationally, it seems an odd time to roll out a real-estate game. But Teller has already lined up brokers eager to boost Web traffic and snag clients. “America is obsessed with real estate,” he says, pointing to HGTV addicts. If he’s right, online goof-offs may soon find a new home.