Because those prices are likely pretty close to what they ran at the start and accounting for the rarity of them.
I told a friend last night that the black 08/09 Edge Campbell, I've only seen 5 of those on the market since 2009 (Not counting the list of them that Hawkquarters had originally).
On the alternate Stallberg, how many of those have popped up, and unlike say, Ben Smith or Brandon Pirri, Stallberg actually played full seasons with the Hawks.
Not saying I'd pay that for them, but I found the prices to be reasonable.