i think when you have website related to one category will be better for earning , but it is logically true , if you have 50,000 page listed in google all , if you have one unique vistor for each page or less for 10,000 pages --> at least 100 click --> at least for choosen adsense keyword 50$ minimum , but how it will take to write and publish 50,000 post then to promote it with serach eninge , how to advesrtise for 50,000 pages it will take at least 1 year to start earning , not full earning ? do it easier , choose your category then start publishing , not 50,000 pages 100 pages , with rich content ... you can do it with to get 50$
There was a sale a while back (it's on all the warez forums now) about a person selling a HUGE PLR content package. More content does generally work by getting more traffic. It used to work, I bought the package myself to be honest (it was cheap). I tried it out. Works the same way as an article directory (or it did work). Well, ever since the major serp slapbacks, it doesn't work too well. If you have 50,000 webpages with unique content, there is no doubt you'll make some serious money. Just make sure you have proper on page SEO.
Writing 50k articles sounds like crap that people often do and post on the internet bulk articles from articles packs, i don't think this method would work..
My new adsense strategy from now on: Get articles that are so boring that people leave your website by clicking the ads. Oh yes and make 50 thousand of them.