Right, it's not GTA ... GTA5 revenues are over $6.4 Billion US. At $90k per month, SS would need about 6,000 years to equal. It's only been around for 5.5 years.
GTA5's budget was about $265 million US 14 years ago. It took 5 years to develop with over 1,000 employees - spending, on average, about $4.4 million US to develop (50 times more than SS revenue per month). Oh, and after the initial release, they spent years working on bugfixes and other aspects of the game.
You're comparing apples/oranges, Mr. Omniscient.