You would have made 15000$ wow !!!:-)
For example, let's say I decided to short sell Countrywide (CFC) and borrowed then sold shares at the price of $35 per share. That was Countrywide's shareprice less than a month ago. Today, CFC is trading around $20. I could by back the shares for $20, give them to the broker, and keep the $15 in profit. So if I shorted 1000 shares of CFC I would have made $1500. Mind you this is a simplified example and there are other rules that apply to short selling as well as closing dates.