Benefit of Blog commenting?

[PoolMaster]

Hello Guys, Mostly all blog site allows comments with no follow attributes but every blog has a lot of comments after knowing it gives only a no-follow value. So I just wanted to know, Whether the blog commenting is beneficial or not?

[WoodsPainting]

Improve Visibility. People browsing blogs that are related to your industry might be looking for the products or services that you provide. ...
Establish Credibility. When it comes to blog commenting it's important to add to the conversation. ...
Form Relationships. ...
Build Links. ...
Traffic. ...
Use Disqus.

[RH-Calvin]

Blog commenting is the process of posting comments below blog posts. The process helps to build no follow backlinks that are helpful to redirect traffic from various external webpages to your domain.