Tyler Cruz makes $1-$3/RSS Subscriber per month (and email subscribers are at least this valuable) and he has 2,000 subscribers
John Chow makes $1 per RSS subscriber per month and he has 40,000 subscribers.
There is a lot of money to be made. If you have just 10,000 newsletter subscribers you can easily make $100,000/year.
I currently have over 600 newsletter subscribers and am learning and attempting to implement ways I can earn $1/month per subscriber.
Here is the best way to get subscribers
GIVE AWAY A FREE EBOOK!!!
Giving away a free ebook and asking for people's first name and email address is the easiest way to get subscribers. Then market your product in forums in your niche. I have gotten 400 subscribers in the last 2 weeks....not bad seeing as it took me 2 years to get 200 subscribers.
So write a free ebook and give it away and start making money from subscribers.