While it is a shame to the app effectively killed, calling it premium priced is just a reflection of how the app store has forced developers to push prices to the absolute bottom. Ad-in the fact that they had no recurring revenue model, getting a ton of new users could actually have been a false economy for them. They did not owe users an explanation of their future business plans, that's not how it works.
> While it is a shame to the app effectively killed, calling it premium priced is just a reflection of how the app store has forced developers to push prices to the absolute bottom.
It's an e-mail client. The major competitors are pretty much webmail (free), Outlook Express (free), Outlook (which you'd only use if you already paid for it as part of Office), Thunderbird (free), and Apple Mail (free). So, yes, it's a premium price for an e-mail client.
If you are hoping to sell, you should price your app at $.99 and hope to get as many users as possible. That also helps me know what your plan is.