A couple of recruiters and companies did reach out to me on LinkedIn after being certified. The positions were too narrow compared to what I do in my current job, but it was a total surprise to me. But when my boss announced in chatter that I became Marketo certified (insted of me bragging), and when our CEO mentioned why it's a big thing for our company, and it was also noted in my annual review, it made me feel more appreciated, credible and a trusted resource at work.