This does happen sometimes. I got GA floor tickets to U2 the last time they were in town the day of the concert. Just phone ticketmaster around noon on the day of and then check back every hour or so.
May times they also release seats they hold back until they're able to determine what's going to be blocked by their set/back-drop and what isn't. Other times it's simply an effort to foil scalpers charging a premium on the doorsteaps of the venue.
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--MR.SKI
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