Sometimes I notice in Google keyword tool that a keyword has very low search volume (<10) and high competition? Why would anyone go for a keyword with very less search volume ?? (note: If Checked in Google keywords tool with Exact match) Though I understand this tool doesn't always have exact data but still any explanation to that question?

Do you guys think that adding good quality blogs to blogger.com and then getting a link from those blogs will help ?

Is there any good blog submission site which does not have long waiting period before article is published and which allows followed link from blog? I have a list of such blog submission sites but they all either need weeks delay till it gets approved or never gets approved. So I would really appreciate If you can tell me some of such sites that you are aware of..

If a site is cached on say 9 oct 2012 doesn't that also mean that Google crawled it on same date ? And indexed it on same date?