I am actually looking at saying good bye to browser (html / css / js and all the madness) and hello to apps that connect to dropbox or s3 or some such cheep server.
Why is the idiom of offering it for free (100% that is) and then look out for supporting the development? How can you honestly do both?
Instead, place it for 14 day trial, offer the entire thing cheaper by 99% (leave 1% fan club away), and support both the causes sufficiently.