Apparently, this poster (We occasionally...) is a PCGS grader. That's why he should know if he can buy or sell coins. The link he provided above, with David Hall's answer from CU, should be conclusive. Unfortunately, it is not good enough for me since it was written in 2003. I wonder if the PCGS policy has changed. What about an update @mynamespat. Are you a grader at this time?
You misread that completely. He was quoting the response from Hall and provided the link for it as well. "We" meant PCGS in the response.
Thanks, @baseball21 I missed the quotes. @mynamespat I was all excited about having a PCGS professional grader on CT. That's why I PM'ed you yesterday.