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The reason they are heavily touted is the net profit margin globe bookmaker's favour increases slightly more selections you add in your multiple guess. Say you select any random 5/1 supply. If you bet this as being a single the bookmaker may hold a theoretical edge in his favor of 15%. Taking two such selections however and betting them in the win double, the bookmakers profit margin rises to around 30% many! Yes your win double can make a much bigger win by the same stake however the particular long term the bookmaker is eating away at your capit