Remember that author can set the additional curators share to 0% :)
They can. But lots will set higher too I bet, so averagely it will still be better than voting the old fashioned posts?
the 5 min windows doesn't mean that you should vote in those 5 minutes- quite the opposite.
The problem is that a lot of people do vote in the 5 min. Also very big accounts vote in that time. So if I vote later, my curation rewards are going down and down... So I don't have to, but I kind of have to :)