I really don't care.
In my opinion, I feel that everyone else is making the issue of including other grading companies in the registry too big of a deal. I don't see why we can't just keep it the way it is. NGC and PCGS have both had excellent reviews, showing the consistency of their grades. Several other grading companies, such as ICG, ANACS, and SEGS, have been in the past known for providing dishonest grades, and often times overgraded coins. If such companies are included, what the registry ends up as is a sack full of lies. If we just preserve the current state of the registry, and leave it there, there won't be that potential of dishonest grades being part of an "honest" organization. I think that having only NGC and PCGS in the registry is sufficient, and that including other companies would be decimating this already wonderful and well organized system. But, most importantly, other grading companys' reputations have shown repeatedly that if they were included in the registry, they would ruin the honor and integrity that has already been established.