According to VGChartz, Black Ace and Red Joker collectively sold a total of 23,792 units since launch (6/30), currently placed at #29. A detailed look at the game shows SF3 debuted with 9,214 units. Sales saw a small surge the following week with an additional 14K.
All in all, SF3 seems to be off to an "okay" start. Let's just hope things will pick up from here.