Brody is making up his own rules in an attempt to sound superior, when what he says is in fact not the case (he doesn't even live around here).
Previously purchased CDs are of course permitted at the CD signings for Broadway shows.
I have been to almost every one in the past four years, have almost always purchased the CD somewhere else for a cheaper price, and have never had a problem getting it signed by the cast and creative team.
"Winning a Tony this year is like winning Best Attendance in third grade: no one will care but the winner and their mom."
-Kad
"I have also met him in person, and I find him to be quite funny actually. Arrogant and often misinformed, but still funny."
-bjh2114 (on Michael Riedel)