Matchbook have started offering a lower rate of commission if you make an offer that later gets matched.I am guessing that their own housebots adjust odds based on those of other bookies,since it is unlikely that they have liquidity in all the leagues that they bet on.If you want to get a better deal out of them,offer to accept odds slightly above those that they are offering,and hope that the market drifts a bit.If it does,their bots will push their offer out,and your bet will get matched at their lower rate of commission.