Yup, I forgot to mention the Tee shirts on sale as well

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To be honest, I didn't see the need for any magical ability when serving customers, taking the cash and assuring people that they could perform the Lights From Anywhere 'as used in the show'. In fact to have any talents other than the essential ability to sell, be communicative, helpful and friendly would be unnecessary. The area set aside for merchandising was right over the far end of the lobby and there wasn't much point in demoing anything as the audience would have seen far more powerful and fast paced magic in the theatre show so a quick card trick wouldn't really be all that impressive.
This reminds me of advice given to me yonks ago when I was asked to compere a show featuring comedians - the advice was to resist cracking any jokes during the introductions, just announce the acts and leave the comedy to the professionals. Or as one guy put it, don't have a dog and try barking yourself.....