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Ultimately we're all just throwing darts here, because anyone short of a sportsbook exec can't speak authoritatively on this subject. But I believe what I've seen written before, by some pretty authoritiative sources:

the short of it, as has been stated many times on here before, is that the house would LOVE 50-50 action if it could guarantee that. But its never going to reliably get 50-50 action so the house has to try to take a profitable position.

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here's an insightful thread.