A caveat here with the stock market comparison, although there are some betting exchanges like Matchbook, most betting is done with fixed odds. That is, the boo

A caveat here with the stock market comparison, although there are some betting exchanges like Matchbook, most betting is done with fixed odds. That is, the book isn’t letting the market set the odds in the sense of trying to balance their action and add vig, they’re trying to get the most “correct” odds. Often this involves tracking the sharp bettors within the market, but not the market as a whole. The sharp odds is another factor that makes it impossible to be wildly successful (in addition to your callout on banning/limiting). Like NFL lines as an extreme example are so sharp that I don’t think anyone could reliably beat them.