Why doesn't Kazaa Lite let you disable sharing out of your own files, like Kazaa does?
The obvious answer would be that it's "not nice" not to share your own files, but disabling file sharing hardly seems more dishonest than, say, automatically giving yourself a score of 1000 :) The rest of KL seems designed around the princinple of giving the user the most control over what the client does, in ways that the original Kazaa did not.
(It's also easy to write a script that would check the contents of your shared folder every 10 seconds, and move out any files that aren't named *.dat, to prevent any files from being shared once they're downloaded.)