It might be reasonable to assume that the owner did not pay "list price" for these speakers as well. Any offer made should not necessarily be based as a percentage of the "list price". We've all seen articles that show us lists prices for speakers, like $8000 pr(brand X) ect, yet a quick search on the 'net tells us the selling price(new) for brand X is between $5-6000.

Half of communication is listening. You can't listen with your mouth.