There’s usually a short spike associated with putting an app on sale and the charting effect can work in your favor in some cases, but in general, longer sales generally have a negligible (and sometimes a negative) effect on grossing. One thing that lower pricing is useful for, though, is building-up your customer base if you’re shooting for bigger raw sales numbers.
— How Camera ’s John Casasanta made millions off a $1 app | VentureBeat
