If you are a writer you are an information marketer. You sell and resell information.
When you write articles, you are making use of information. When you sell or resell those articles, you are selling and reselling information.
If you use the articles in books and/or adapt those articles as books and ebooks and sell and resell those works you are again selling and reselling information.
If you allows others to sell or resell your articles or books by signing up with Clickbank and/or giving them the resell or reprint rights then again you and your affiliates are selling and reselling information.
You of course must rewrite to improve how this information in marketed. You must rewrite to update this information.
However, you are an information marketer.
The product that you are selling is information, and this information is put into a salable form--an article, an ebook, a book, a CD, a CD-Rom.
Information can be made into video, audio, software. These are also forms of marketing information.
If you are an idea person, good at working with ideas, good at thinking, good at putting ideas into writing, into video, into audio, into software, then information marketing is your type of marketing.
Once you have the information in this form, then you can place your articles on websites that buy web content, you can distribute your books and ebooks via your own websites, via affiliate websites, via distributors. You can self-publish and/or publish with commercial presses.
If you like working with ideas, and information, and like keeping up-to-date information, like doing research, like this type of work, and especially like selling digital information products to products like candy or toys or VMC satellite TVs, although you like writing about and reviewing these products, including writing about the stores and companies that sell these products, then consider becoming an information marketer.