"Where do PGM and uranium investors fit into this regime?"

PGM or Platinum wouldn't fit anywhere into the four new hubs. Perhaps PGM/Platinum could be set up as a separate hub. Uranium would probably fit into non-precious metals, or it might justify a separate if there is enough interest.

And cantjustread is suggesting a need for a hub for day-trading and hot-stock discussions.

Agoracom admin posted this in the Forum Leaders hub:

"Anyone with additional ideas is welcome to share them with us. We'd be happy to cater to your requests and look forward to your contributions within our community."

All it takes is an email to contactagora (at) agoracom (dot) com

I sent in a suggestion for these four new hubs and they went live within four hours!