Occasionally websites get really good comments, but if you get much exposure it is going to take a while to clean up all the overt spam attempts that exposure brings, especially if your topic is SEO...many people are attracted to SEO because they want to make money without doing any real work or creating any real value. I think that is part of why I liked it off the start.
And if you don't keep it clean, the next thing you know people who have made decent comments on your blog devolve comments to the me too level and sign their name as #1 rated Viagra mortgage poker coupon. I just went back and deleted about 30 comments from a person who cleverly hit me up today with about 10 coupon comment spams. Thanks buddy! There are some things large sites can get away with that smaller sites can not. For example, About.com has sections on some of their pages named something like also spelled as. Unintentionally, I slip a number of misspellings into this site, and get roasted frequently for it. Although, nobody has ever told me why the grammar and spelling police typically give dysfunctional useless feedback like "you misspelled a word" often without saying what word / where / how you misspelled it.
But if you left comments on your own blog not under your own name then spelling errors might be more appropriate. I have even seen some people take leveraging their comments one step further and troll on their own site to pick up other keywords, make the blog look active, or create fake controversies.
If you do not actively check out the comments it is not worth even having them on your site. As search engines get better at linguistics (and eventually they will) having a bunch of spammy comments on a site will linguistically link pages to a bunch of other spammed out sites and spammy topics. If you lose a bit of distribution here and there in a couple important channels competing sites get to enjoy self reinforcing market positions.
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