I can understand that simple reason of course. But 1. many obviously dynamic sites use disqus anyway and 2. why would i want to split my own content (blog + discussion) when obviously i want to have a dynamic site? Ok, some people don't care, some people only have static webspace.. to me it seems strange anyway. _Especially_ since this seems to be about an open source alternative for self hosting (so, you have a static blog but still host a dynamic comment section? wtf?)
And you lose commenters (like me) and give away control over parts of your site as well as content.
Also by the time you outsource a comment system due to CPU your site probably is big enough for a "real" CMS.. or atleast better hardware, it's not like a good vserver is expensive nowadays.
Not everyone is a knowledgeable web developer, or is interested in the security maintenance of a custom solution, of which you have even less knowledge about the data they collect.
For example, I have a friend who runs a small business selling music samples. He uses WordPress because it is a simple solution that can do a lot for him without a super amount of technical savvy.
I think WordPress is disgusting, but the point is, there is a market for these products. If you feel strongly against this trend, you should consider developing one that drives your vision that has similar practical value.
