Earlier quoted context omitted.
> I would also guess that sports betting sites like DraftKings or FanDuel would be even less efficient Your strategy doesn't work on sportbooks to begin with, because bookmakers don't move the odds with the action. That is, there is no such phenomenon as "the over is exciting therefore overpriced". Bookmakers price purely based on facts and statistics. Their pricing isn't affected by excitement nor by how many people…
>Bookmakers price purely based on facts and statistics. Their pricing isn't affected by excitement nor by how many people are betting a certain way. If this were true, lines would never move unless there was breaking news, but we see lines move all the time without there being any material change to those "facts and statistics".
Without there being any material change you can see. If you had access to all the tips and data and insider information that sportbooks operate with, you could be a bookmaker too.