Experience in the sport?

[mrbaseball]

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If you'r not a sports fan

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Actually fans make some of the absolute worst sportsbettors and (at least in baseball) the herd mentality created by the ESPN generation is what leads to many of the big edges that can be found almost daily.

That said you really should have some understanding of the sport in question and expecially in linemaking procedure and mathematics that go into each potential wager.