It's a premium when you look at the average price of software on the Mac and iOS App Stores. It's also premium considering my computer comes with a free email client and Google provides a free webmail app.
When I look at the top paid apps in the App store, I see at least as many >$10 apps as I see under $10.
If I look at my own App store purchases, $10 is easily on the cheap side.
It's amazing how so many people are complaining about the EOL'ing of a software app that's equivalent to the price of two lattes (one if you're talking about the mobile version), especially when the Sparrow guys said they'll be providing bug fix releases as required.
> It's amazing how so many people are complaining about the EOL'ing of a software app that's equivalent to the price of two lattes
The value of productivity software that is integrated to your workflow cannot be determined by its cost of purchase. Try taking Microsoft Word off an author's set of tools, and telling them that they only lost $120 and shouldn't be complaining.
Moral of the story: don't bet your digital life on cheap, cool, transient, proprietary, made-for-App-Store software built by enthusiastic young startup founders or "indie" developers.