There's someone on Audiogon right now selling the Extremas for 9250$. He's definitely overcharging, but you can see their worth.
http://app.audiogon.com/listings/full-range-sonus-faber-extrema-with-stands-shipping-cartons-beautiful-2013-01-25-speakers-37876-sevierville-tn
http://app.audiogon.com/listings/full-range-sonus-faber-extrema-with-stands-shipping-cartons-beautiful-2013-01-25-speakers-37876-sevierville-tn