[Hello Kitty]

I don't think a second server is a good idea. If you're asking for a full-on add-on only server like moat or serious, then god no. They're hella laggy, it's like playing DarkRP. It looks nice and all but nah.
Vanilla servers aren't popular anymore, and Gmod is a dying game. I doubt having a secondary server will help.

Our server is already having issues I don't believe we need to primarily focus on a new server. I believe we all experience issues with running Gmod due to the addons. And again as Christian stated previously, we don't have the player base required in order to run both, it would be pointless just to have another server without players.