The $30,000 was likely a two week rental rate for the US Opens, NOT a sales price.
Just a bit of confusion on the web.
If the home was listed by an agent, then the price will reflect that the owner and agent have decided they want for it. Some properties may sell for over or under list price, you need an agent to assist you in coming up with the right strategies.
If the home is a foreclosure by RealtyTrac, the price is meaningless. The home is not on the market and may never be on the market. If it does show up, the price then will be substantially different.