Not entirely sure what you're asking but comments on blogs aren't spam if their a real person giving their imput on the subject. But you're probably not asking that right?
I think they are separate things... commenting on your own blog will not attract spams... They will come eventually..
may be if you comment about unnecessary things that doesn't have relation with the topic that you comment.
blog commenting will not comes under spamming once the admin as approved u r comment , if people likes u r comment they gonna click on the users name where it redirects to the website, so that u will have visitors and more over if u provide the blo commenting with the specific keyword that will improve the keyword ranking as well
It depends on type of comments. If you genuinely comment on any blog post then its not considered as SPAM IMO. DON.
No, posting comment in response to feedback etc.. does not count as spam. To help protect your blog from spam install capatch system.
If you're commenting on your own blog post, no it's not spam. You own it. It might not go well for your visitors if they find that you're adding comments simply to make it appear as though you're getting visitors. But is you're just adding to what you've posted, I think that only helps add to your trust building by giving more to your readers.
The comment should not look like spam and be relative to the topic so that it won't be considered and look like a spam.
depends, on a tech blog, you are commeting something and linking to a hosting provider, that's spam. If you are just complimenting the writer about the post (After reading it of-cource). That's not a spam.