[gaming_mouse]

Well, if a total blank comes and you are sure your opponent will call you, then you are right, this doesn't make sense.

But there are plenty of times where you could be drawing to more than one thing. For example, there could be a straight draw and a flush draw on the board. You could be fairly sure your oppo has a made hand, say a high pocket pair.

In this case, to use opitmal bluffing strategy, you would bet whenever you made your staight draw (assuming that's what you were really on), plus x% of the time when the 3rd flush card hits, where x is determined by the method described in the OP's post.

gm