If it's a "dofollow" blog then yes, that's considered a backlink. Keep in mind, the owner of the blog would have to approve your comment with your link in it for it to be counted.

No, your baclink count does not increase with more views to the comments you've made on other peoples' blogs.

I hope this helps.

Many, many factors.

PR of page, nofollow or not, page indexed, authority, google crawl frequency,
discounted as spam, number of links on the page, etc.

Views of comments has no effect.

Paul