"....But everything's free, what would I get if I sold you something that I couldn't get elsewhere?" The confusion is real.

.. But that's not important! Helpfully, Sephiroth points out the many, many, many barnacles. "Those things. Aren't they bad to have on something?" Aren't they also food? Didn't they .. also need water?

The van is eyed speculatively. It did not look like a boat to Sephiroth. Land barnacles sounded like a disaster waiting to happen.