I’d be thrilled if the iPad edition of Instapaper sold one-tenth as many copies as the iPhone edition, and I think that’s optimistic. Would you put in another 50-100% of development time to increase sales by 10%? (I’m going to, but that’s because I’m that kind of guy. I just spent months hacking the Kindle edition of Instapaper that’s used by almost nobody and makes almost no money, simply because I wanted to use it myself and I wanted it to be awesome.)

Marco.org - Loosely organized initial thoughts on the iPad

Great attitude! I think this is what makes great software.