Tapping into the nostalgic geek market? As much as I like the HP 15C, I'm not spending $30 for an iPhone version of it. They need to re-evaluate their price.
http://www.berryreview.com/2008/04/22/review-calculator-apps...
http://www.berryreview.com/2008/07/31/calculator-apps-part-5...
iPhone application prices are unsustainably low. I find the $30 price point to be a very encouraging sign.