I'm baffled by this too, IMO Polar Bear backs are the most attractive affordable back. Polar Bear's were put in with scrap tobacco, making slightly tougher than some backs, yet the price is still low.
Just looking at the PSA population report, only roughly 5000 Polar Bears have been graded by them (less than Old Mill's

), compared to the 50,000+ Piedmonts.
It'd be great if a PB expert could tell us some more about the undervaluation of Polar Bear.
Owen