Primaldemic, like many other free-to-play games, will have some paid ways to keep the game's services afloat and myself supported. There will be a few ways you can spend your hard earned real life currency, and I'll now go into more detail about them.
Primaldemic will have a fully finished story mode available on its proper non-early-access v1.0.0 launch. This storyline will cost anywhere between USD$3.99 to USD$14.99, depending on the total length and content.
Primaldemic will also have some paid bonus levels you can purchase and play. These would be more of in the metaphorical sense of collaborations such as custom boss fights with certain collabs, if that even happens. Other than that, DLC could also contain some unnecessary side-stories or extra dungeons that are purely for fun! Don't worry, none of these bonus content DLCs will ever cost more than USD$7.99, and new content will more likely be a free update rather than a DLC.
This is a remniant of when PrDm was going to be an open-world game and purchasable characters are probably NOT going to be added, rather instead; characters will be UNLOCKED.
This is a remniant of when PrDm was going to be an open-world game and is still being determined on how the currency system will work in a non-predatory way.