Quote from Daal:
This is not right. As far as I'm aware the only way to win at slots is when they are the 'jackpot' types where a certain % of the money gets accumulated overtime and at certain point the machine achieves positive expectancy. If she is 'winning at it' she is lying to you. Sorry to destroy your marriage
Speaking of winning at the machines. You guys need to check out an episode of criminal masterminds (title ?). There was a guy who QA tested video poker machines. Well, apparently knowing that ICs never generated truly random code, he was able to deduce the seed and modulo algorithm for certain manufacturers.
He and friends made millions until they were finally discovered (too greedy) and went to jail. He would likely have been more successful taking his knowledge to wall street and starting a hedge fund. Less chance of getting busted if he was working for the right folks.

SEC just starting using data mining; talk about being behind the times.