You can purchase FG, you can win some in the lottery, you can do graphics work and sell signatures/art and also help out in the homework helpline forum if you are smarter than the average troll. You could also play other games for FG to use with LS.
You could also invest a little time and effort and eventually find something worth FG, but people usually prefer the easy way.
The choice is really up to you, there's lots more ways of earning FG if you try.