power sellers fee

I would like to object about the fee for power sellers. Although I was made a power seller, I still only sell low cost items.  I might put 20 items on at $2 each at a cost to me of $10.  If I only sell half of the items I recieve $10 from the buyers which breaks me even and then the PP charge and I am out of pocket.  So I thim=nk the power seller charge of 50c should only be implimented for items over $10.    Regards Ross