Because they're a bunch of bastards with big enough magical balls that they'd probably figure the system out by day two- obviously you'd get a lot of magi that fell through the cracks, or got swallowed by demons by meddling with forces they didn't understand, but the big houses, the ones that run the MA, would likely be fine, if joining that world didn't immediately get them Karma'd to death.
Hell, there are probably enough magi in the MA that meddle with concepts that they could make the karmic system do whatever they wanted. The magic system in the Nasuverse is both a lot more hard science-y and a lot more soft-science-y than in Pact. It'd be like one of those dropped-off-in-another-world-stories, only it's a couple of nations dropped off in another world, and they've got guns and artillery to the natives' copper swords and Firebolt spells.