http://bentasker.i2p/posts/blog/general/mailarchive-has-been-discontinued.html
Because I dual-home my sites onto Tor, I get Onion search engines such as ( Ahmia.fi ) crawling too, increasing the load further. Obviously, it's expected that search engine spiders will account for most page views - most humans just don't try to click through every page, they'll read a few and then go elsewhere.