The outcome of winning is positive in the sense of cashflow, but the actual outcome on you is more likely to be negative:

http://www.forbes.com/sites/susanadams/2012/11/28/why-winnin...

So while not winning in the lottery might seem like a bad outcome, in fact you've avoided an even worse one. Which confoundingly means rational winnings maximization strategies (such as picking less commonly chosen numbers to reduce the odds of sharing a prize) in fact make the expected outcome of lottery playing even worse.