I don't get it either.
What makes this different from a standard error 404 page?
Why would every visitor each visit get at least 1 error page? If you are causing errors or simulating errors to drive users to a page, why would you want to do that?
If there isn't any content on the error page, what are you using to influence the type of AdSense ads that display?
No offense intended, but this looks like a good way to get an AdSense account banned.
"Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote." -- Benjamin Franklin