"I'm, uh, pretty sure they won't--"

Her attempts to explain are falling on deaf ears, aren't they? Oh well, maybe it'll just be easier to make a point of showing how many are actually in stock in the booth when they get there. Perhaps even ask one of the staff for confirmation, if they're not too busy.

Honestly though, Ritsuka doesn't really mind, newbie enthusiasm is pretty entertaining in its own right, after all.