Joshua Topolsky of The Verge recently sat down with Instapaper founder Marco Arment. For those unfamiliar, Instapaper is a popular app on the App Store that allows you to save an article or a piece of the Web for later reading. The app has a slick web interface that allows you to manage content, along with a browser extension that enables you to mark content easily.

In the interview above, we learn more about the economics of Instapaper, and how it has fared against the release of Apple’s Safari Reading List. Arment also shared why he has not released an Android app, calling the economics just not good. He also made a great point that not many Android users are actually buying apps. Instapaper is available on iTunes for $5, and Arment said that is a price most Android users just will not pay. He also said that Instapaper has been unfazed by the release of Reading List, along with the rest of the competition Instapaper is currently stacked against.

Furthermore, Arment helped found the popular microblogging website Tumblr. We learn about the roots of the company that currently gets about 13 billion pageviews per month.

You can check out the interesting interview above. What do you think, developers? Is it worth developing a paid app for Android?