The idea is that bad gamblers are more likely to be bad at predicting risk. They also mention more research has to be done into the element of anticipation. I know there's the idea of being optimistic, 'being on a sure thing' 'Having the perfect system,' but the anticipation can be as much of a thrill as the win, and bad risks can be taken because the memory of the thrill of a win can be prominent, while a loss is something to be forgotten. You can't and wont avoid the thrill of winning, but losses are to be denied for any number of reasons. There are of course the official odds for example 1/2 red/black, but it's easy to forget the odds stay the same even after any number of consecutive matches. Then of course there is the fact that due to the amount of gambling in Hotels, and Casinos with public bars, many gamblers can be blind drunk, or at least be artificially optimistic. It's amazing how losing your shirt can aggravate a hangover.