Nothing is more picked over than Parkers, they are one man's ceiling and the other man's floor. You've prolly over paid for almost any Parker - so if they say 2009 is going to be the first days of the dark ages to come - well your going to take the hit. Only the cream of the crop Parker will command anything - ones of questionable heritage will be raked over the coals of hell.
Otoh, the AH Fox Sterlingworth Philly gun has been the gun of the 2000s, if bought in the middle 90s you have seen a 3-4Xs increase in price.