I see how packaging up an existing bookmarklet and selling it is an app could indeed be construed as unfair (although, a point could be made about the added value of the package itself). Creating an original piece of software, on the other hand, and making it available to the public for a fee, is the very definition of fair play in my book.
Absolutely right! Bookmarklets are software like any other and deserve to be treated both by their creators and their users with the same respect and expectations that any other software gets. Great work, by the way-I'm happy you took a craftsman's approach and made something worthwhile.
Hacker News readership can be a tough crowd, but I wouldn't want to have it any other way ;) Thoughtful comments (i.e. where the reader took the time to do a little bit of research before commenting) make it all worth it.