I think you have to look at poker like any other job. It's like running a small business or working on commission. If you quit, you need to either replace it with another job or spend the time wisely. It's your life and do what you want with it but don't go out and say that playing poker is something bad or evil because you are just doing it for the money.
Many people have their jobs for the money. They probably get something else out of it too, like friends in the same business, co-workers, a sense of accomplishment, and other things. You can get all of this out of poker.
There is nothing wrong with playing poker for money. Hopefully that is not the end game for yo though. Remember that money is a tool and not the end all.
If you did make 500K or not, it doesn't matter. If you're happy with your decision, good for you but don't try to come off all high and mighty because you won and you quit. It would be nice to see a graph