First of all why Korean, did I miss something funny and obvious or is this casual stereotyping?
Second of all this game is exactly what you make of it just like all others on the market. Just because you've decided to play one way and dislike it doesn't that is the only way to play.
GTA, all it is is grinding. Get a gun, shoot someone. Get a car, run over someone. There's no fun!
But you are correct, this is by no means instant gratification, it's like Fallout or Minecraft rather than Garrys mod. The pleasure is in the journey not the destination.
To take the Minecraft vs Gmod - If you can just summon 50,000 exploding barrels the spectacle is as fulfilling as wiping your nose. If it takes time and investment then it makes the end result worth all the more.
To this end look at how you play and why you are doing what you are doing, are you on powerplay, are you taking missions. What is your end goal, are you here to get X ship or are you there to experience the game.
Have you tried all the game has to offer (mining/trading/combat/community goals/exploring) or are you always looking for the best profits?
I had most fun recently in the beta in a stripped out Eagle for under 600,000 Credits racing around planets like a lunatic, sure I didn't earn money in that time but it was really really fun
Tl: dr, if you dislike it do something else, the game has many ways to play, don't focus on credits as hard as that may be.