I really think it's more than that for many people. The game Jetpack (Joyride) for instance, offers a paid version. I do not know a single person who purchased

I really think it's more than that for many people. The game Jetpack (Joyride) for instance, offers a paid version. I do not know a single person who purchased it, but I know lots of people who were extremely into the free one. Same with Fruit Ninja, and Peggle.