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I'm not sure if I'm totally following what you're asking here, but let me give it a shot.
As a blog owner myself, I can say that the general idea of blog comments is along the same lines that of forum replies. The purpose of comments is to get conversation going between blog readers and writers.
There's really no limit to the number of comments you should leave on blogs. The main consideration should be that they are quality comments. There's nothing wrong with leaving comments on multiple posts (blog owners appreciate this as it shows you are reading their blogs) or even leaving multiple comments on the same post as long as it's a back and forth conversation and you're not just having a one way dialogue with yourself (similar to "bumping" on forums).
For the general purpose of obtaining links for ranking, more than one link per page is not going to increase your rankings any.
Hope this helps.
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