This game appears to have sold around 1mil copies so far. But if you check VGChartz you can see that sales are staying pretty strong and steady especially in the US. Now with the Japan release date set for March 26, I think this game will soon be selling more than the 1.2mil the current price reflects. I think sales will stay strong for a longer time than most other games. VGC has 78k in Jan and 90k sold in Feb. in US alone. Basically, I strongly agree with what a few have been saying. I'd say maybe 180dkp or so, with a good chance of going higher.
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