I am not sure if you are aware of this but in a post on this topic.
http://forums.2kgames.com/forums/sho...d=1#post813524
Only 15% of the player based has bought the DLC, 41 Percent are aware of it, and 43% are not aware.
That means for a public match to ever happen would almost be nearly impossibly.
I can say for myself I have put a great time(10 hours+) in playing this with a group of 3-5 people, all of them owning a DLC, and never even saw a new map appear.
Meaningless to say, a private match is splitting up the community. The people who bought the DLC(15%) want to play on the maps, meaning 15% of the community will be leaving Public matches to play private matches.
By doing that, your splitting the community up. No matter what you do, the community will be split up.
And don't you think when a new gametype comes out on the playlist saying "DLC Games" or whatever, the 43% of unaware people might spark an idea saying "Oh a mappack?". Not just free advertisment but a great idea.
All I read was, we want to not split the people who fill our paychecks from the people who do not. We the payers don't get what we pay for because the people who didn't want someone to play with? Doesn't quite settle well...