[surye]

I think rather it's a revenue issue, until relatively recently there was no way to profit from updated games, so you're better off moving on to the sequel, or next year's edition of the game. Also a lot of the video game development culture likely stems from console releases, which again until "recently" could not be updated (only new versions of disks/carts for future customers) so it was not feasible to plan for future maintenance, beyond what was necessary for derived codebases.