Just to test it out, I wanted to see if my code would work for MSG3 experience presale despite purchasing two tix with my code in November. During the November Verified Fan presale, my code was denied after I purchased my two tix. Today, the code was accepted and was able to pull up 1 GA.
Based on the ticket cancellation rules, I did not purchase today's ticket. However, the mods and folks at u2.com may want to explore how to permanently block a code after the allotment has been used up. I can imagine there are some people willing to take the risk at the expense of other fans not getting tickets, which is a bummer. Anyway, good luck to everyone in their ticket buying process.