I have no intention of trying to manipulate the market; this just seems like an opportunity to me. I will not be doing it with very many bitcoins, either absolutely or as a proportion of the number I have.
Spread is a bugger and to be honest I think anyone trading short term using bitcoinia is an idiot, but I am not in it for a few ticks. On the other hand I don't really trust bitcoinia, or at least it's not the kind of institution I would want to keep a balance at for very long, so I would like to be out within weeks/months.
Way I see this is that gearing is an alternative term for leverage for a reason