Just like the prblogger you have shared there is steve pavlina , another great blog earning money .. read on the 7300 word article he has shared every tiniest detail onthis subject matter --
StevePavlina.com was launched on Oct 1st, 2004. By April 2005 it was averaging $4.12/day in income. Now it brings in over $200/day $300/day $400/day $1000/day (updated as of 10/29/06). I didn’t spend a dime on marketing or promotion. In fact, I started this site with just $9 to register the domain name, and everything was bootstrapped from there. Would you like to know how I did it?
go on here :
How to Make Money From Your Blog