I don't think your example contradicts this article vey much. Your program already had a relatively high price (compared with most items in the app stores), and

I don't think your example contradicts this article vey much. Your program already had a relatively high price (compared with most items in the app stores), and it will obviously always be point where an increased price will hurt sales. The article was directed to those that priced their software peanuts, like $2, and should raise their price to $10 or $20.