Oh yeah, you're right. I was thinking of it from the perspective of the individual reader, not of the poster.

I think besides "oooh, can you believe what so and so said!!!!???" posts, the innocuous "an interesting post" or "I don't agree w/ this person" or "here are some neat links" posts (which would be public, and there would be no reason to hide the link) may help smash the "only people who have me friended read me" perception, also.