Generally I try not to snipe people whom I know are
readers of this list,
however lurkers get no such help :-)
Calling 'dibs' however seems akin to a modern day version of the prisoner's
dilemma.
Half the time I don't even look at the other bidders, or if sniping, may
have placed my bid days ago.
OTOH I don't intentionally step on anybodies bid, ie several items, I bid
where there are no bids.
STuff I really want though, I bid on, and if my friend keeps bidding, well
why the heck are they? Regardless its easier to settle later, after I win
the bid.