Re: Rubbish
Similarly, quite a few tickets for gigs and festivals use QR codes... they are often emailed as PDFs, and can either be printed out, or presented to the door staff on the screen of my phone. The door/gate staff will either use some dedicated stock control hardware or a bog-standard mobile phone to scan my QR code.
I've even been in a queue for a gig when our party has realised we're a ticket short, and my mate has bought one online on his phone before we reached the gate.
It strikes me that the system is cheaper to administrate than sending out hologram-embossed pieces of card.