[prometheuspk]

This is a new idea.

How exactly will this work? I mean opening the code and keeping the app paid. Will accepted pull requests get a cut of the money?

How long before someone takes this code and builds another reader for metafilter?

[arpit]

There are quite a few examples of open source but paid applications. One that comes to mind is Gina Trapani's Todo.txt app that someone forked, cleaned up and put on the Google play store. She went into that quite a bit on her podcast: http://5by5.tv/inbeta/47. If your app is open source, don't be surprised if that happens. Such scenarios are part of the value you are claiming.