To expand on the breadth of your knowledge (Score 1)

Certifications are worthwhile, but only if your employer is will to pay for them, and the materials needed to get them. I've gotten several certifications, because it rounds out my knowledge in the specific area I've worked in, where I've delved quite deep, but know little in associated areas. Certifications allow you to develop the areas where you haven't had any experience, and ultimately improves your understanding across the board.

Plus, those that whine about not having them, probably can't pass the tests.