I am with Gavinb on this.
I set myself achievable targets and if I hit them, great. If I fail, I don't worry as every day is different and it balances out over time.
The more you put into this game, the more you will get from it. How much depends on you. Though I don't see the need to publish earnings, we could ask ourselves honestly; are we jealous of those who say they earn more, or do we hold in derision those who don't. Or are we happy for ourselves and for each other in that we can encourage each other with useful tips on what has helped us to stay in business.
John