Good point Tessa. Guest blogging on a popular blog I would think would generate more traffic, but it is nice to read other people's posts, and comment on them too.
Also, provide the same value, and provide good content even when commenting on blog posts.
If you are taking the time to read and comment on blogs, you might as well not make yourself useless and write, "nice post" and that's it. Elaborate when you are commenting on a blog post.
Thank you Tessa.