I am HIGHLY opposed to two-packs or multi-packs in ANY action figure line, whether it's G.I.Joe, Star Wars, Indiana Jones, Justice League, or anything else by any company, much for one of the reasons stated by MUNDO.
As one who opens and displays his figures, my main priority is the condition and the appearance of the figure. And I have too often had it happen where one figure in a two-pack will be the most neatly painted and nicely assembled figure you could ask for, and the other one is a cross-eyed disaster that looks like the factory worker sneezed while trying to paint its boots with a brush usually reserved for home walls. I had to go through this recently with the German Soldiers two-pack from Indiana Jones. Don't get me started on multi-packs, where you have to hope that three, four, five, or six figures are all in really good condition.
Until something can be done about quality control...

... KEEP 'EM SINGLE!