Exploiting Ground Zero for money is distasteful. There will always be some who look to profit from tragedies. What's next? Joplin Tornado coins? Souvenirs from the Japan Tsunami?
What's distasteful is making a speech at Ground Zero, invoking the tragedy for political gain. Or how about selling T-shirts or Bumper Stickers (for profit) saying "Remember 9-11"? How about burying debris from Ground Zero in a garbage dump? What do you think should be done with artifacts found in the debris? You can look at the 9-11 event as an Act of War, or as a Criminal Act. If you see it as an Act of War, then I guess your fervor against selling artifacts would also extend to artifacts of WW2, Viet Nam, WW1, the Civil War, the War of the Revolution, all the Roman Wars, etc., etc. If your view is of a Criminal Act, then I suppose things like Clyde Barrow's car, Jessie James' gun, the wall from the Valentine's Day Massacre, John Wilkes Booth's clothing, et.al. should be off limits. By your reasoning, I would think that if someone was killed in an automobile accident, then we should preserve the wrecked automobile (and any change that the victim may have had on him, or was found on the floor of the car.) The tragedy of 9-11 was indeed a terrible event, but if we are to memorialize or sancitify the spot where every human has been killed, then we will have little room left to walk on. In a few years, 9-11 will be no more remembered than the events of 12-7, or 2-15, or 6-28 (you've probably already forgotten those.) I'm sorry for the rant, but I have little tolerance for those who carry the flag in one hand, the Bible in the other, and preach their morality and virtue to all.