Patch 2.4 Notes

[Mordekhuul]

If these numbers carry to other 25-man bosses, then a full BT/Hyjal clear is worth 28 badges per week, while a full clear of Karazhan will still only be worth 12 badges per week--the same number as running SSC. So the only reason to run KZ (or heroics) will be if you are currently clearing BT, Hyjal, SSC, The Eye, Mag, Gruul, ZA, the Sunwell Plateau, and still want to earn badges faster.

A full Kara clear nets 22 badges (more if you go for the animal boss, I suppose), and only takes about 3.5 hours tops with a geared group.

Its a pretty good time investment, even for higher end raiders, if there is badge gear for them to obtain =)