I think you're mistaking what is currently available in the game for "long term prospect" when it's not. A few months for hundreds of thousands? No way. Playing properly right now you'll probably make that in a week if you're playing the game regularly. The reason people are spamming 9k paying jobs is because it helps elevate the feeling of grind from losing 2k every time you die anywhere. As you increase in rank and get more options the missions start to pay more and more. Grinding 9k missions where you have to kill tons of dudes and risk dying is no different from grinding races. So "celebrating" that they disable one but not the other is stupid. Have you considered that some people also like playing co-op missions more than competitive ones?
Anything that is in GTAO right now is meant to be attainable very quickly. Anything that is "long term" for months ahead is not in the game yet, because Rockstar will be adding them. Once they add Heists in, it'll probably throw the entire economy out of wack immediately.