1. Your Blog Is Your Resume Now!
2. You Will Become Thinker.

Blogging really helps us to get a lot of random thoughts. You will go on learning more about the topic you are blogging and more ideas will blossom.
3. You Will Have New Relationships.

As you go on blogging, you will meet a lot of bloggers and it helps to grow 'blogging' relationships. You can exchange your ideas and build relationships.
4. You Will Have Online Fame.

Your blog introduces you to the world. Your blog is a showcase of your expertise in your field. You will lead a group of passionate people with your blog.
5. You Will Earn Money.

If you want, you can even earn money with your blog. There are a lot of ways to earn money through blogging such as PPC ads, affiliate marketing and many.
6. You Will Have Credibility.

As Penny says, Blogs are great credibility builders. Getting on topic you are interested and giving your opinion can really help to build your footing and credibility in the marketplace.
7. You Can Tell Your Story.

Blogging is a way to share your stories with your with your readers. You can have a personal touch with your friends and family.
8. Your Presentation Skills Will Improve.

Through blogging, you can organize your random thoughts to neat ones. Your way of explaining the events or things will improve.
9. You Will Inspire Others.

Blogging helps to improving yourself and in addition it helps to inspire others. It can an act of investing your time and energy for a cause.
10. You Think Your Own Advantage.
I listed a few killer advantages. Now you think of one reason why blogging is useful.