Street prices here seem to be a 40-50% jump for XHP, not nearly double the price. Considering you're increasing the wear resistance, and therefore the life of the blade, by at least 50% and getting a significant increase in lateral toughness and corrosion resistance as well, I'd say that's really a bargain.
Now not everyone will need/want those attributes, so I completely understand being unhappy with the price increase, but when the price increase falls in line with the performance increase I have a hard time with labeling it overpriced.
I really think you have to compare apples to apples in terms of pricing and, in this case, that means knives with similar materials and the XHP models look to be very, very competitive in that market segment. Right now for $90-100 you can get a Blur in Elmax, a Manix 2 in S30V or a Recon 1 in XHP. The Recon may or may not be the best buy of the three, as that will depend on individual needs, but it's sure as heck earned a place in the conversation.