that has to do with where the eyes wander naturally...
see, most eastern cultures read from left to right, top to bottom...
it's less likely that somebody is to look on the left, bottom corner...
beeing lazy, they will start looking at top left, to right... then middle, then they'll skip to bottom right....
that proves the point why I read best place for a counter was left bottom, and that lower right banner you guys just posted...