IFMU
Yes you have a point but most of the fuel will end up in the airbox.
Ask your self why the engine makers take such trouble to fit the primer nozzels as near to the inlet valves as they do? It is because they want to get the priming fuel into the cylinders not the airbox!, if they had wanted the fuel in the airbox they would have saved the money and told you to pump the throttle a few times before you start the engine (no comments from Robin owners please!).