It is important to have in place the process controls that are required to help quality and productivity, however as far as certification goes, it's more of a marketing tool. Maybe at some point larger clients may insist on it but I don't know of any requiring this yet. The costs for certification are high and recurring, so right now no thanks!
Certifications like these are first and foremost a marketing and sales tool. By being certified, you can eliminate your competition that are not as long as you convince your customer that it is an important standard.
That being said, the technical standards behind a certification may be worthwhile and help drive innovation and change. Manufacturers of software and hardware sell the new standards as the must have to keep up.
The real question is how many of your customers really care. How many times have you worked on a job and have it perfect and the customer hates it versus something that you are embarrassed by and the customer loves it?