This is about making money. Anyone who tells you that you can setup a site and leave it forever and make money is sadly leading you down the wrong path.
I created a website 1.5 years ago and been completely updated since last year. Well I came back to do some market research and found that half a dozen similar websites (even better) have popped up. Of course I fell behind since I did not spend time on this.
The point is that always be working on your website and process's or someone will take you out.