Sales is also a rather short-term, target-oriented activity. If you would incentivise developers on those same short-term goals, this would have a negative impa

Sales is also a rather short-term, target-oriented activity. If you would incentivise developers on those same short-term goals, this would have a negative impact on the quality and innovation of your product, since they'd also start chasing the quick wins. This is not to say that developers do not deserve a bonus when performing well, I just don't think it should be tied to Sales.