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heavily bet

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I think this sword cuts both ways. Heavily bet means that the lines are typically correct and profit in sports betting comes from finding "incorrect" lines. With only 16 games per week and per team per season there isn't a lot of opportunity to uncover real gems. I think the randomness of it when lines are applied decreases the possible oppotunities significantly.

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This would make sense Mr. B except the house is such a large participant in the NFL betmaking market. They don't set up lines to collect 50/50 on each side, they often stake a position of their own and are more frequently than not correct ('05 notwithstanding). I have some doubt that this phenomenon occurs anywhere close on even a quantity basis in baseball, let alone a percentage basis. This isn't to say winning at the NFL is easier, just the fact that it's heavily bet by amateurs and frequently in the same manner plays a very big role in finding good bargains in the NFL (again '05 notwithstanding).