By the way, i would not classify the gambling addict on the basis of the result of gambling. An addicted gambler who gambles a lot using a lot of portfolio may be lucky and winning but he cannot win forever. There will be a time when he will lose his bets and since he over-exposes his capital he will soon find himself in a big loss and there is nothing to be proud of if anyone is having a patch where he is winning some consecutive bets. Also skill does not play any part in it and hence it is not right to say that someone is an experts in predictions. No one is expert as no can know the outcome of all the matches.
It is very unlikely for a gambler to be able to win continuously without losing at all because after all there is no element of consistency in the results at the end of the game, if that were true then of course it would mean that gambling could be said to be a risk-free activity, but the fact is that no matter what and until whenever gambling will always be a risky activity because the risk will always be part of the game.
Gambling is a business for casinos that aims to benefit them as a whole and in the long term, meaning that if you are nothing more than an ordinary gambler like most gamblers then 90% accuracy with a long-term winning streak without losing at all is unreasonable.