On top of this being a raffle, it's not even a good business plan. The value of the house is supposedly $394,000--to recover that amount they would have to get 2627 people to pay them $150. I kinda doubt that's going to happen.
Right, my assumption is that someone smart enough to set up a whole nicely-designed website is probably too smart to not have done the simple division I did to get the numbers in my post.