[cwilkes]

That’s interesting. Do they publish the history of what it costs to place a bet?

There’s quite a few variables that go into the pricing: how much you think a team will win by and the payout if you win the bet. So there can be multiple tracks for “I think my team will win by 7 points” and there might be someone willing to pay 2 to one odds on that while another is 3 to 1.

Maybe betfair sets the rate? This number has to change over time though, can purchasers of a contract sell that contract later on if the odds or payout changes dramatically?

It would also be interesting to see where the “knee” is in those bets. For example winning by at least 7 or at least 8 points in American football should have about the same odds due to the point scheme that has a touchdown plus the extra point at 7 points. Course you could also try and go for two so maybe there is a price difference. Anyway it would be interesting to examine.