There are so many good reasons a writer or blogger should get involved with memes, either by linking up or starting their own.
Occasionally an image is the main dish within a post. But in general images support your article. And perhaps break up a very long narrative. Or a set of photos over time may well show a personal journey or story.
Guesting free for a higher ranked blog than your own can have a knock on effect. Your website rank may well benefit from the host including your bio and site url along side your guest post.