The rate that DC puts out it's HC's is hurting the titles, I've spoken to at least 4 random people in my LCS who wanted to catch up on a series but they can't because the singles have long sold out and there are no trades. One of them was a 12 yr old who wanted to catch up on Batman (he has the first HC) only to find out he has to wait until March for the next trade...

I guess there are always the digital issues but that is kind of ruled out for people without tablets (many younger kids I'd imagine in that group)