Yeah, how dare the developer ask for money for HIS WORK!
That being said the reviews for the iPhone app are not very encouraging.
Just the same, I'm not aware of developers refunding money when you find out the s/w you just bought, and were unable to test out prior to buying, is really a pile o' junk. It goes both ways, ya know.
Personally I rarely buy s/w unless there is a trial version or I've played with the full version somewhere (like the Apple Store or on a friend's machine). I'm loath to buy s/w blindly.