The best way to value 1% off perfect inherent items, is to use this guide, find the perfect version of your item, and reduce it's value by 70-80% (ish)
So for a req10 15^50 chaos: 100-150k
For a req10 14^50 chaos: 20-30k
(Although, with the market in it's current state due to the imminent release of Nightfall, I'd say this is sitting a little lower. 15-20k, atm.)
looking for PC on gold chaos axe
wilderness