Will this not be true of the whole rigmarole of "carbon offsets"? If you're rich—which in the U.S. mostly means one demographic group—you'll have a distinct advantage over everyone else. But "cap and trade" or "carbon offsets" is meant to apply to all—because we're all in the same boat.
Only the rich will be able to buy their way out of self-privation for the greater good.
It's almost like we've rolled the clock back before 1517, when Luther objected to the sale of indulgences!