Most people are convinced that betting cannot earn profits to gambler in long-term perspective. It’s obvious even for those who are a great experts of statistics and probability theory. The only simple rationale here is: If bookmaker organizations exist, it means that they earn money from this business, and if they manage to earn then gamblers are supposed to spend. However this could be an absolute true if there would be only 1 bookmaker around the world. But its not like that and nowadays we have a hundreds of internationally recognized bookmakers.