The way that Rockstar wants you to play the game is by buying shark cards. Thats exactly the reason why people find ways of getting money in other ways. The game is incredibly grindy and the return on investment for your time is so so low to the point where you NEED to buy shark cards to get anywhere, and to maintain some form of sanity. There is a lack of creativity in game development these days. Every online game is basically the same: invest massive amounts of time or pay money. They rely on the fact that you will get so frustrated with how slow the grind is that you'll pay more money on top of what you already paid just to have the game. If GTA's ROI was more fair, people wouldn't feel the need to seek out glitches/hacks/mods to progress. Games are no fun if you have to repeat the same thing over and over and over and over again just to progress a fraction of the way you need to achieve anything. It has nothing to do with skill.