not sure why anyone is surprised by the price. the last of us (ps3) still retails for ~$40 and the ps4 remaster will likely have the dlc included.
having purchased but not played it for ps3 i'm pretty torn. not that i really want to rebuy it but with the dlc included maybe it's worth it just for the higher resolution and convinence of having it on ps4. hrm.
edit: lol, went to the SEN page and the ad is still up.