Are we talking about ShoeMoney, on DP? I have only $95 so far in adsense. I need a quick way to get $5 more but I've been pretty lazy. And I have no sites atm.
Everyone on here that has made, for example, $20 in 15 months, has to rethink what they are doing. I suggest you read through this site a bit more to grab some tips from experienced users. I create a site and within a few weeks have made $20. It all comes from playing with ad placement, quality content and links. If you site makes $20 in 15 months, you are kind of wasting your time.
People are not PLC's. Why do you think they will state how much they earn? You will be better off by using this time in doing SEO.
I saw a screen shot of that dr. chow or whatever his name is adsense earnings at Armand Morin's bigseminar. It was always in between 250-500k. On average it was about 400k a month.
Maybe they earn a lot of money with their ads but they eat a lot of bandwith and need strong servers.