The starting bid is at $100. That's not what the car will ever sell for. That's the minimum starting bid. Most people don't bid until the last hour before the auction closes.
That car most probably has a reserve price of $15-20,000 (the Kelly Blue Book value of a 2008 Mustang
is $16-23k) so if the bids don't reach the reserve price, then the seller doesn't sell the car. Most cars have a reserve price. You are never going to get a 2008 Mustang for $100 or even $1000 or even $10,000 if it's in good condition