Angry Birds and other games are in a totally different category. If you buy “Angry Birds Space” it’s reasonable to assume (a) you’re done with the original, and

Angry Birds and other games are in a totally different category. If you buy “Angry Birds Space” it’s reasonable to assume (a) you’re done with the original, and (b) you’re going to get as many hours of enjoyment out of it as the original, so it’s fair to pay as much. This isn’t the case with productivity applications, necessarily – you can keep using Delicious Library 2 and it’ll keep working great, so we need a way to reward customers who say, “Yes, I’ll pay to have some extra functionality.”