Thanks again. The wikipedia article actually seems considerably more measured—behavioral changes are observed, but for a small percentage of subjects in most studies, and at those levels I really wonder how much is a placebo (on the part of the observer, not the cat, ofc)
The general tendency of the result isn't very good for declawing. Especially considering the amount of cats that get complications from the surgery.
The studies cited with positive results for relinquishment pushes for other risk factors such as understanding and investing in you cat as a contributor to positive outcome. Maybe people willing to pay are more invested in their cats, and go with what a veterinarian recommends (which may be declawing).