Success is one of those "user designed" terms to me because we are all looking for different things from our businesses. Most would like to make a profit, of course, as it's just a hobby without the money. The level with which we are satisfied and classify as successful will be highly individual though.

For myself, I would like to replace and somewhat surpass my offline job income so I could quit and just work on my business. To me, this would be the ultimate freedom. I don't have to get rich, although that wouldn't hurt. Mainly, I want to be free of time clocks and bosses.