How about some actual prices?
Plants vs Zombies - $20 on website, $10 on Mac app store, $7 iPad, $3 iPhone.
Pixelmator - $60 on website, $30 on Mac app store.
Aperture - $200 in box, $80 on Mac app store.
Autodesk Sketchbook - $80 list, sale price $40 at Amazon, sale price $25 on App Store.
But there are lots other publishers trying to maintain the same pricing as their older sales channels, so the marketplace is still churning on this one. Hard to say how it will ultimately work out, but there's little evidence that prices are feeling an upward pressure.