The volume was generated at the headquarters at 57th street in NYC. They hired a bunch of traders to trade MKXT/LSPD only and make markets in wcom, nxtl, etc.
The way they get paid is through volume, thus the mkxt rebates. All they have to do is make .01 and they'll get paid. The only bad things is that the firm was eating the loses to generate volume.
See what happened to the ET stock after the aquisition??? lol, this is the only beginning.