songs of lost innocence

Saw this in an article about a new U2 album that was given away free (to a half million iTunes users) at an Apple event. Apparently Apple paid for that album:

“We were paid,” Bono [said]. “I don’t believe in free music. Music is a sacrament.”

I don't get it. People should pay for sacraments? Or getting paid makes it more holy, in his opinion?