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Re:Instapaper Releases A Full API — With A Brilliant, Unique... by clawr on Thursday February 10, 2011 @05:15PM (#2204064)
Once for the Instapaper subscription, once to buy the app from the third party developer (if it's not free)
Re:Instapaper Releases A Full API — With A Brilliant, Unique... by StavrosK on Thursday February 10, 2011 @07:18PM (#2204533)
Yes, but this is sort of like people having to buy a router even though they pay for their net connection.
Re:Instapaper Releases A Full API — With A Brilliant, Unique... by true_religion on Thursday February 10, 2011 @10:30PM (#2205041)
More to me like having people buy software even though they already paid for their computer.

Instapaper is the backend. The app is the added value. Likely the 3rd party app isn't going to eclipse the brand of Intapaper so they'll be selling their added value directly to existing Instapaper subscribers.