It is very much app dependent, some apps can only have good sales for a week, while some others (look at Angry Birds) can pull off high volume of units per day for over a year.
Personally, I've had strong sales now of Gravonaut for a few months, slow start but picked up right after and has been fairly consistent.
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Personally, I've had strong sales now of Gravonaut for a few months, slow start but picked up right after and has been fairly consistent.