$0.50/1000 is a bad deal for Lightspeed. I highly dougt that 1515 is getting that rate unless he is adding liquidity 100% of the time and Lightspeed is keeping his rebates. Does lightspeed cross their own trades?
bad for lightspeed in that you can get better or that Lightspeed loses at that rate? From a trader's perspective, .0005 is a VERY GOOD deal. Also, 1515 says he is getting .005, not .0005 (that's $5/1000 vs .50/1000) At .005, THAT"S not a good deal, but at .0005 (as I quoted), that's a different story. I think there is some decimal confusion going on (as well as bad math).