Originally Posted by Hardball47
Why would anybody do this?
Because, strange as it might seem, not everyone who plays poker is a relentless sociopath focused solely upon winning every last chip on the table by any means necessary.
Occasionally, someone who actually likes the social aspect of poker finds their way into the game, and often that someone is motivated by wanting to be respected as well as being liked; and they see demonstrating their l33t p0k3r kn0wl1j as a path to being respected. Also, flagging
2+2 is a way to show other possible 2p2ers that one is a member of the club, and thereby earn "insider" status with them.
From a Mum Poker perspective, talking about 2+2 is obviously a bad idea. Not everyone at the table agrees that Mum Poker is a good idea.