To my shame, worked briefly for an arm of the business which ran the betting site. Since people in the office were constantly comparing our offers to competitors, noticed a few times when other websites had set up introductory offers which were simply too good, & you couldn't lose (provided you kept to the limits), so made a bit of money out of those.
As an aside, always remember the dour atmosphere in the office when someone won big on our site. One week they gave us all a bottle of champagne to celebrate success & only a few weeks later the whole thing was shut down.
To my shame, worked briefly for an arm of the business which ran the betting site. Since people in the office were constantly comparing our offers to competitors, noticed a few times when other websites had set up introductory offers which were simply too good, & you couldn't lose (provided you kept to the limits), so made a bit of money out of those.
As an aside, always remember the dour atmosphere in the office when someone won big on our site. One week they gave us all a bottle of champagne to celebrate success & only a few weeks later the whole thing was shut down.