It's true, they will make money from it but it is a bit disconcerting that Japan, which seemed to genuinely like FFXIII did not give it's sequel much fanfare. 2/3rds decrease in sales is not a good thing, even if you did break even. 500,000 units is a success in Japan and the gaming world, but FF titles usually hit 1 million units pretty easily, the drop off shouldn't have been as sharp the second week, but then again, I guess Bolivar is right about this being the norm nowadays. Looking up a few games to compare, Type-0 is still below XIII-2 sales despite being out longer (course the game has been largely ignored by everyone), and I never realized that Crisis Core's bulk of sales was from the first week in Japan, it did pretty poorly in PAL regions and not as good in US as in Japan. It's only finally hit 2 million+ after being out for so long.
Course, it will probably hit a million+ units sold once it hits the West, we just have more people and its not like XIII-2 isn't coming out in a lull period of the gaming Calendar, I mean what is it even up against in February? Most of the big titles have already been released for the holiday season, so Squenix is at least smart enough to know when to release a title.