In the old days of business cards, all of the people I worked with that had certifications listed on their business card were the ones that knew all the buzzwords, but had no real-world experience with their certifications, but maybe that was just a local phase for a while.
They might help a person get into a specific project or job, but I tend to stay away from those projects that require that type of expertise because it seems that the clients/employers don't really know how their methodologies work if they think certifications can deliver a better product.