Instapaper pulled its free version of its IPhone app from the Apple App Store over a month ago…and well, sales of the paid app are fine.

Marco Arment, creator of Instapaper just tweeted:

As an experiment, I temporarily pulled the Free app from the App Store over a month ago. Sales of the paid app remain great. Few complaints.

What I like most about Arment and Instaper is he experiments with different monetization strategies for his app and API, and shares his thoughts and reasoning with the rest of the world.

I think sharing the stories, as we are all figuring this out is important for the industry as a whole, and it is great marketing.

Arment says it’s not just about the money, it’s about the product.  And he’ll blog in detail about it soon.