After Apple has been offering the possibility for some time now to reinstall application features for a fee, Google is now also catching up and offering in-app-purchase. This is particularly pleasing for developers, who hope to achieve higher sales with their apps in this way - users are apparently more willing to buy something later than to buy a more expensive app from the outset.
What do you think? Is in-app payment a killer feature for you? Personally, I'm skeptical if the developers are making good use of it.