If anything, Apple's App Store has shown that 1 euro is "impulse-purchase" terrritory. 1€ will result in just 40% of the downloads of a free app, but for 2€ it's already 5%, and 5 euro is 0.1%.

There are apps, like gPodder, that are free in ForMeego but paid in Ovi. Buying on Ovi is like a donation, and it grows the number of useful apps on Ovi ("battle of ecosystems" and stuff).