LONDON -- "The bookies always win," as they say -- but so can their shareholders. Look at Paddy Power (LSE:PAP), for instance, whose shares are up 1,000%! In this video, David also discusses the fortunes of William Hill (LSE:WMH) and Ladbrokes (LSE:LAD), and talks to Sonia Rehill about three factors that investors should look out for when evaluating a bookmaker's potential.

Unlike entering a bookies, the odds don't have to be against you when it comes to investing! The Motley Fool gives you more of a chance to succeed with more share ideas, found within our latest free report "How To Unearth Great Oil & Gas Shares," which describes how to pinpoint potential winners from the resources sector. You can download the report here. But hurry, all Fool reports are available for free for a limited time only.

David owns shares in William Hill. Neither he nor Sonia own shares in any of the other companies mentioned. The Motley Fool has a disclosure policy.