When I launched, I thought that I had 3 guaranteed sales and that there was a possibility that I would only sell 10 copies of the software, in total.
I was also afraid I could be undercharging, so I decided I would increase prices if I ever reached 20 sales. I used that as a marketing strategy: special price for early birds.
Well beyond the first 20 sales, I have just increased the price 50%, and left the door open for future increases by still considering it a discount.
Let's see how sales go from now on.