They didn't actually "buy" them. They just placed commitments, pending LSU getting picked. Think of it like going to a hotel where sometimes they put a hold on your credit card for a certain amount for incidentals (like room service or movies). If you don't order any of that stuff, you get your money back when you check out.
Same principle. LSU didn't get picked so the fans won't get charged. The hold for the funds will be lifted.
Besides, even if they did get charged...hello E-bay or Stubhub!