Steam doesn't show the value of games like that. This is poorly photoshopped. The ELA is really bad. ( You can see the edits around the text if you look closely )
And why would Steam determine a Sale value for you?
It dosen't , but there is a website called SteamDB.info which does that using Steam API . it's not photoshoped , look here for an example =>
https://steamdb.info/calculator/76561198064940241/?cc=usOh shit. My mistake jack. I retract what I had said
But the amount is photoshopped IMO. He needs to list all these games for me to believe it.