Asking stupid questions for one.
If only I could down vote this stupidly pointless post.
^-- this is generally what I avoid, plz no downvotes. :(
I don't moderate my posts without good cause, and even in those cases I tend to append edits instead of changing content--a practice both more honest and respectful of others.
I can count on one hand the number of posts I've deleted, only two of which were in poor enough taste that I felt strongly enough to remove them.
Your karma score, beyond a perhaps ten or so points, is inconsequential--if you write things that are worth reading, you need not fear reprisal. An individual post (or posts, or thread) may lose you a few or a few dozen or a few hundred points of PG Funbucks, but if you generally engage in thoughtful discussion it is only a temporary setback.
I believe it would be very much a loss were everyone here to self-censor because they're afraid of losing points in a token economy.
Think clearly, write carefully, and post fearlessly.