It means I lease a seat and pay a montly fee. The advantages are lower fees and access to millisecond data, which I need for my proprietary automated trading strategies that I developed from years of experience trading lean hogs and other specialized markets. The cost is irrelevant, as my many highly skilled traders, that I mentored for free before giving them a seat at one of my exchanges, make more money in one day, than all the traders on ET make in one year. J_3