"What's the deal with the gray color?"
It was an 8th color in the BJ set. I ordered them before we opened.

"Were they ever used on the tables?"
NO

"If not how are they in the hands of collectors?"
NO. Only 3 of each one is out at this time.

"Is there an 8th color in the paulson set?"
NO

"Is there a four table in the paulson set?"

YES, its on the Rain $5 table.