I checked just for sh*ts and giggles, there is a PSA 9 of the '59 #11 for the price listed, the #53 for the price listed etc...So I'm assuming they picked the highest price or grade for the card and used that as their prices...
You only pay 8.08% guys!
http://phoenix.craigslist.org/evl/clt/3310325602.html