If you aren’t already aware, bookmakers have a built-in “House Advantage” in their odds. Most bookies give themselves around 5% profit margin. This means that on average, they stand to win about $5 on every $100 that their customers bet.
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Having multiple bookmakers allow you to choose the best odds for each game, bringing the House Advantage down to 1.5% or lower. Now you only need to be slightly smarter than the House to turn a profit.