I could not agree more, Mersh:

While I can understand the reason behind switching from Apache to NGinx (I would have selected lighttpd over NGinx personally), this just sounds to me as though they are overselling their services and need to squeeze more people per server to be able to make up the difference. Normally, when a host has a performance problem, they either get more servers or, if the performance problem is caused by a handful of users, they have those users move off to their own servers so as to not hurt the performance of others. These guys are addressing the problem by switching to a virtually small user-base system. This will either be their biggest achievement or their biggest failure.