I learnt from the forum that dofollow blogs are helpful in ranking high in search engines as well as in Pagerank.I read we can check for 'nofollow' tag in 'view source' of the browser whether it is dofollow or not. I collected a great number of high blogs with 'nofollow' tag.Then i read somewhere on the forum about 'nofollow' commenting page.so i remained with 1/3 list of few high pr dofollow blogs. Now I wish to discuss the value of these high PR nofollow blogs.I do have lots of unrelated to my niche PR 8, PR 7, PR 6 nofollow blogs.Would commenting on these benefit me somehow?
if the blogs are nofollow, then the PR doesn't matter as google will not follow the links anyways. you are not getting PR or link juice transferred from such sites/pages. that doesn;t mean that they dont have any value. yahoo and bing are 2 other major search engines that still follow such links and credit the backlinks so there are some values to that still
I heard the other search engines get almost 30% of the overall SE usage. That's actually a pretty big chunk. So I'd say, it's worth it.
Probably, in US this is the case (though I tend not to believe it), but in the rest of the world, the share of Bing and Yahoo is invisible - 2-10 % depending on a country.