Honestly I don't know like most of the other gamblers,because we may win many times but still wanted to gamble so any amount can't make us to stop from betting but if someone really new to betting but they won in few millions then they might quit gambling for a reason.
This is the case that a person become addicted into gambling. A person once addicted into gambling and experience of winning it cannot stop him to continue playing. There is a big chance to stop if there is a discipline and determination to overcome the addiction.