Factor in that price the fact that Williams-Sonoma guarantees them for life. My Pro610 had a gear issue and it was replaced with the great customer service I got when I bought it.
Some people seem critical of WS prices, but it is a boutique catering to upper income people who want the environment, customer service, top quality merchandise, and a knowledgeable staff. That place is a treat to shop in. We don't get that at Sam's and Walmart. That type of shopping experience comes at a cost. And most WS shoppers enjoy the exclusivity of their signature items.
Another WS customer service advantage: Their recipes are exceptionally good. And their premium ingredients have been very good. I usually don't do anything not-from-scratch, but those ingredients are my version of fast food.