This is why I had to quit. I enjoyed it way too much and would spend nearly all my free time playing it, much to the detriment of the rest of my (non-professional) life.
> I enjoyed it way too much
Well if you enjoyed it it's was not a waste of time! Much human endeavour (and _all_ hobbies!) are ultimately pointless.
If it negatively affects other aspects of your life it's a different story though.
It was kind of a blessing for me that I was forced to quit after they introduced PLEX and in doing created a conversion rate for ISK to dollars. Suddenly I was too aware of how worthless everything I was doing was. It's one thing to spend an evening grinding to buy that new ship, it's another when you know you were grinding for 73 cents an hour. Risking losing a ship you spent a week earning the ISK for is thrilling and scary, losing a ship you can replace for eight dollars is just annoying.