I think it is worth it.
To be honest, I haven't computed how much I earned because I don't like computing gains, or else I'll feel guilty about the spending but I know some people are doing it.
Also, it actually depends on your strategy so investing X amount in the game will produce different Y gains based on the things you do. There is no specific amount of earnings. It all depends on how you play the game.
I think I read a post from @libertycrypto27 about investing and calculating before, or you can read this post from him, or you can read this experience from @queenstarr about her earnings.