I used to post auctions, until one I was watching got posted. After that, I decided not to do it anymore. Now, the only thing I will do, is send a PM to somebody I know is looking for something I find. But that's it, PM only.
"Jjust bid the amout you're willing to pay!"- Sure, that's exactly what I do, although I choose to place the bid at sniping time. The thing is, an auction with only people who found the auction themselves will close cheaper than one with lots of extra traffic. Advertising Works, folks! Don't think that posting here doesn't matter- there are LOTS of people who read these boards that never post. Think any of them will hold back a bid just because they see a bid from "didyoujustcallmekremmit"?
As for items with no bids, that's a different story. Any time I see an item I want with no bids, I put in a little placeholder bid, usually just a hair above the starting price. This is done precicely so that I have "staked my claim" for people that know me from BYOAC. (I'll put in my real bid at sniping time.) If you're watching an item with no bids, don't be stupid, stake your claim! Otherwise, you've got nothing to complain about when somebody else bids on it or posts it here.
And as for items that are mis-labeled, in the wrong category, etc.- these are the very worst ones to post here, as they are the ones where there's a real chance of getting a super deal. A while back, NoOne=NBA got a mis-labeled yoke for like 30 bucks- think that would have happened if it had been posted here?
For those of you who think it's great when auctions get posted here- do your own homework!