Keep your eyes open for those golden opportunities. If you fancy to take advantage of them, do them, and if not, do whatever else you want to do while waiting for the next one.
Sometimes people do what they feel like doing, even when the payout is less then something else, sometimes the reward takes a different form. Some people only grind what makes the most credits, or the most reputation, like they are racing to achieve something without ever stoping to actually enjoy what they are doing; the only reward being that they hit that goal. Some people do a bit of both.... But everyone has the opportunity to keep an ear to the ground for that lucrative deal, and choose if it's either something they want to do, or not.. More will come.
If someone makes a years worth of credits in 2 hours, good for them. You have the same opportunities; just keep an ear to the ground, and if its something you want to do, enjoy! Hopefully more opportunities like it will get peppered in throughout the life of the game, and when they do, try to be ready for them... If you want