@rogers*records As I explained in my posts in this thread, PLA is really not designed for sellers of long tail one offs. However, you aren't really correct when you say the seller has no control over what charges might occur. The seller determines the click rate, AND the seller provides a budget, so that he has a spending ceiling. So, there is some control.
I explained in my earlier posts that this CAN indeed be profitable....for a seller with the right business model. Neither you nor I have that sort of business model.