binexx do certainly NOT have the financial markets sewn up, what a ridiculous thing to say!
liquidity on betfair FTSE + DJIA daily/midday/hourly betting is FAR higher than on binexx, by several orders of magnitude! Most of the hourly FTSE's on betfair reach £150k+ in matched volumes, whereas binexx struggles to get above £500 a lot of the time!
binexx has very little activity, whenever I go their site the volume is often 0 for the latest FTSE/DJIA hourly future