Isn't AC losing a potentially significant source of revenue by not allowing those who have already secured a cert upgrade from switching to a paid one? Given the shortage of SSWUs, I'm sure that some would opt to save a cert for another trip if they could do an LMUP. Simply showing if there was an LMUP option at web check-in would allow for someone to change there booking online and pay for the LMUP. As I mentioned earlier, anyone who doesn't want to play AeroLotto is precluded from considering an LMUP.