Because it has all the nice options you might want, but would pay more for if you had to do them yourself. I prefer stocks that allow me to get a more even rearward pull on the trigger like the Choate.
My Model 70 has a thumbhole stock, a floated barrel and a Jewell trigger. The stock and trigger alone cost $400 above the price of the gun. It fits me perfectly, but I had to pay for it.
Having shot 10FP with the Choate stock and Accutrigger (I believe the one I shot had a shorter barrel than 26") I think it is the best out of the box rifle for the money if you are going to leave it alone. Accuracy was sub MOA and the Accutrigger was impressive. It was the best factory trigger I had ever felt. Not a Jewell, but very, very good and perfectly adequate. If my gun had come with an Accutrigger, I likely wouldn't have ponied up for the Jewell.