What rational reason is there for them not to bring the game to PC? It would absolutely sell. Odd company, it's like they don't realize the platform exists, or someone at Rockstar really hates it for some reason, because it would surely be profitable.
Same with RDR, would it sell as much as either console version? Maybe not but if they had ported it while it was still hot it would have definitely been profitable for them and considering they have an entire studio dedicated to porting stuff i don't understand why they never did.