I'm a little short on time, so I'll reply more later.
But, to be blunt, I'm not a Powerseller, so I don't really care about the DSR rating, since I am not thought of enough be be eligible for a discount to FVF. Mine is 4.8 by the way.
I've only been selling for 11 years with a 3000+ feedback that's at 100% averaged over the 11 years. But I don't qualify for a discount.