[Basssiiie]

Note that this probably isn't the action of Rockstar Games. Most of it, along with the price, might be handled by Sony itself, as it is released as a "PS2 classic". Sony wants to get a lot of such games into the store, after the many questions and comments on the removal of the backward compatibility in the PS3. Why shouldn't Sony add the best-sold PS2 game then?

That's why GTA San Andreas is in the PSN Store now. R* just gave it some extra publicity.