Why can't "Heavy Rain" drop in price?

[Psybits]

here's a little something on how greatest hits work

http://en.wikipedia.org/wiki/List_of...est_Hits_games

as for heavy rain, I hate that I missed out on when gamefly had it for $20 used/free shipping..it got sold out in a couple hours..
I hate how their system works too, I was able to add one to my cart and go all the way to check out, then when I was at the final step to place order, it suddenly told me that my cart was empty and when I tried to add it back it said OOS