If the prices are too high, that could lead to issues where someone who b can't afford to regularly be taking it might not end up riding if the free compartment

If the prices are too high, that could lead to issues where someone who b can't afford to regularly be taking it might not end up riding if the free compartment is regularly full even if the paid one never is. OTOH, I suppose it's also possible some people might not ride now due to prices but would be able to if there were a way to ride completely for free.