I can think of two reasons: A) content posted on the other post also appears on cadwallr's website, which as another user pointed out could drive more traffic to the website, which lil is avoiding; B) lil, and some other hubski users, have their real life names associated with their usernames, and so may wish to be selective about what posts appear on other peoples websites or are in other ways "trace-backable" when lil or others may not want to be traced back to the content of the original post.
thanks ref. a third reason, I just wanted to start a discussion without it being necessarily part of the other discussion. oh-oh, you've outed me now. I'd better watch what I say. It's too late now to create an alternative self, although if I did, it would be my rapper name: L'l Lil. One of my favourite slogans for this place is: Hubski -- where everyone knows your fake name.