How Should Devs Handle New Maps?

Is it reasonable to ask for new maps to be free? Should they offer a few for 5$? Or just release a couple for free?

I’d very much like the idea of them having fancier maps with Rebel Bases or Flood present and charging for them. I know that would be risky splitting the player-base tho.

It has been stated new maps are free.

Not being free would split the community.