Bad concert karma?

I have a question, and I'd like an answer.

I saw tons of concerts in college. 

On the day of the show, my friends and I would never, ever play the music of the band we were going to see that night.

I'm not sure whether they thought if you played the band's music the day of the show then the show itself would be bad or if it was as toolish as wearing the band's T-shirt to the show.

But I'm curious. Have any of you ever heard of this before? 

(AP Photo)  

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