Why don't Sony and Microsoft update their top selling games every financial period?

[Jranation]

Farsala said:

Individual SW sales of each game isn't that important to Sony's bottom line, so they feel that investors don't really need/care to know about it. Of course Sony will still do PR after a successful launch, touting numbers for a brief rally, but afterwards it isn't so important.

Especially when a game like GTA V makes Sony more money than almost all of their smaller games.

What smaller games?