Not really. The basic driver for registration is to provide CONFIDENCE to (existing and potential) customers that a supplier has a system that conforms to a standard. From the customer's perspective, as Andy already indicated, it can represent a huge benefit, simply because you don't have to send representatives to assess for yourself if the supplier has, indeed, a system in place. When you realize that many organizations have hundreds of suppliers in far away places, many time zones away, that can be a huge benefit.
From the supplier's perspective, the possibility of avoiding multiple, redundant, inconsistent customer audits is also a huge potential benefit.