I don't think any NA sales are out for it yet, but it sold a lot less than FFXIII in Japan. I think XIII-2 around 770,000~ sold on the PS3 there right now. For a comparison FFXIII sold 1,501,964 copies on the PS3 in Japan in 1 week.
Why would anyone sane expect FF13-2 sales to approach FF13's? FF spinoffs have never approached their original games, the only one that's even within half of the original is FFX-2 and that was literally the first, before we learned to expect a quality dropoff from such titles!
A better comparison for FF13-2 are games like Revenant Wings and Crisis Core, both of which it outsold. And especially compared to what I assume is a relatively low budget, I would assume FF13-2 raked in some pretty nice profits.
Could be wrong, though, I haven't actually seen any estimates for 13-2's budget.
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