When you write a review, you are basically speaking positive volumes about the goodness of a company. In turn, you make money when ads are on your blog and the company you're blogging about gets more business, because people want to know if the product or service is worth purchasing.
Zappos.com sent out an e-mail to customers this morning entitled "Help Others! Write a Zappos Review." Did you know reviews drives scores of traffic from everywhere out of the woodworks online? They work wonders for online businesses. If you haven't already done so, start blogging now and get a dedicated server so you can host WordPress on it.
Check out what Zappos said today in an e-mail to their opted in customer-subscribers:
"We hope you have a moment to review a product you recently purchased at Zappos.com! When you take the time to Write A Review, you help millions of Zappos.com customers make a better buying decision! If you've ever read a customer review, then you know how helpful they can be when deciding to place an order! Please take a moment and Write A Review. You never know who you are helping in the process!"
Being of service and helping others meaningfully is true transformation of the heart.
Once again, reviews help businesses sell more and earns you revenue from online advertising. There's more than enough money for everyone on the web to be made.
That said, start a blog now and get organized with creating content, so you can get a piece of the online ad money pie!