the premise of a mobster who made it big, retired and is forced back into the life appeals to me.
Correction: gangster instead of mobster.
You have literally just described every single GTA game in the franchise.
no dude GTA 3, vice city and san andrea the characters are not rich and have a good life and are forced into crime again. they either have a debt are already on the wrong side. GTA 4 was about obtaining power.
Claude is a criminal before the game and continues to be a criminal through the game. Tommy is a criminal before the game, put into prison for 15 years and then continues to be a criminal. CJ was kind of a criminal before hand, left the city to do crime in Liberty City and then came back home to do more crime. Niko ws dull dull dull so I don't remember anything about his story before the game began.