Generally I don't think anything is unpredictable, but one thing I know for sure is that the game is rigged. From what I have seen, if you win a certain amount on RNG, there is a code embedded in the system to make you lose some. Also if your playing those roulette machines at your local bookies (like ladbrokes, william & hill, betfred etc), you need to put in atleast 500 GBP or more, because the more you put in, the greater the chances of you winning....I have seen this happen nearly everytime. The chinese and koreans of where i live, come in to the bookies and usually start from around £500 or more and they finish with a bankroll of 2K to 3K on the roulette machines. Some people might say thats just unreal winning on RNG roulette, but all I can say is if you know how RNG works, you will have a better chance of winning than anyone else. Personally I'd rather stick to real wheels :-)