> if you pay the amount you can actually make money on in six months, you don't get very many people accepting your offer, because people don't know as much as Zillow knows about what's about to happen in the housing market.

I mean... wouldn't that be because people do know as much as Zillow knows about what's going to happen in the housing market, so they're happy to wait the six months to make more money too, instead of letting zillow make a profit by doing nothing more than sitting on it for six months?