Writing articles on your industry is a great way to cement your status as an expert.
Articles can be used to promote your business in any public relations activity, but can also be repurposed as blog posts, website copy, newsletter content, eBook chapters and much more.
This type of marketing is an altruistic way of sharing the useful information you have stored in your head with the people who will benefit from it. The payback for you is increased credibility and, maybe, new customers.