1.) I did around $10,000.00 per month working with some of the ad networks like AdSense. We were working around 20 hours a day and had over 1,000 websites.
By the time we paid the bills I was making about $4,000.00 per month. It was not worth all the effort being put into it and we stopped.
2.) Last year we did around $12,000.00 per month with my web design company. It cost me about $6,000.00 per month to run and was a lot of headaches. I've had the web design business for the last seven years and have always made money with it. But depending on what else I've got going on depends on how many jobs we are willing to take on.
3.) Currently I am doing around $5,000.00 per month with the web design business and started playing with the affiliate marketing stuff about two weeks ago. I've made $80.00 with the affiliate marketing so far. But keep in mind I've got very little time to put into it.
If your going to make money online the most important part is making money the same time you start your site. It's the only way to keep yourself interested in the project.