Thanks skinny3 - my thoughts are that for someone to to profit someone has to lose. Its kind of like the casino house time charge in a poker game every half hour. The money is leaving the table and leaving less for the players. In this case the house is represented by the big players who have the wherewithall to execute these trades on the two exchanges when the gap is like it is today. Someone making $ on nothing of real value - just a loophole in the two market listing system. "rage" is a good portion of the word.