The only info I've heard is that initial figure of 128,000 units during its first three weeks. Considering Ouendan tanked in Japan, has EBA done comparitively better?

It has tanked has well in NA ,even Reggie Fils Aimee was vocal about his   deceivment  about its sales .

I believe it's under 150k for the US. Most of these sales came in December.

Seems strange that the Japanese version wasn't a huge seller, and not only did they bring it to the western market, but they're making a sequel....

..That or they might feel that it can move some DS hardware, therefore making them a little bit more profit.

..Or Nintendo entered into a contract with the 2nd party to make 2+ games before sales came in for the game.

But by this, you must first know what Reginald's sales expectations were initially. I'm sure he (NOA) was expecting a few hundred-thousand copies. MP:H managed to garner 300k+ iirc.

Well I plan on getting it someday, and I don't think a sequel is uncalled for. It's more of a niche game I guess.