What some attempt to do is make a living off of just one website. That's very very hard. You must have millions of hits and that is a daunting task to get to those numbers. One thing to consider is having a couple hundred niche domains. Content drives people to your sites. That can be self generated or people putting content on your websites (even better). Imagine making say $200 per year off of each website. Is that realistic? In some cases yes and in some cases no. I own over 1000 domains and have been doing this for around ten years. Some domains generate $50 a year and others generate $500 in a month. I know every business has it's own numbers, but what I am seeing throughout all my sites is it take around 1000 hits to generate about $3 to $9. So do the math. If you have 10,000 hits the high would be $90. Again, that varies based on the domain and how much links are paying, but those are averages. It takes a lot of work. It's not easy unless you have the next Facebook, PlentyofFish.com or myspace. Possible yes, but not a get rich quick business. 1000 domains cost around $12k to $18k for renewals, hosting and different software for the domains. That's per year! If you build a pretty good site you have a much better chance of selling the website for more money than you can make in revenue.