Another potential issue is mixing of season and non-season ticket holders. If one group uses a different technology than the other, integration of the two could become a pain (and possibly get expensive).
One possible use for an RFID tag could be ordering something from your seat. Punch in a food or drink order, scan your ID, go pick it up in an express line during intermission or have it brought to you, with charges going through automatically. Hopefully the scanners aren't too sensitive.
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