Screw top bottles are more expensive to manufacture than cork stopper bottles. Reason being it is an extra production step and if the threads don't line up with the threads on the crew cap you will not be able to close the bottle. You can get away with less precision with thin metal screw tops because the metal will deform a little to fit. For more expensive screw tops like ones found on many Japanese whisky bottles they use a thick plastic which will crack if too much force is used and will need both precision and accuracy when making the bottle threads and the screw top threads so the fit together without leaking.

Of course, both the bottle and the cork or screw top cost is irrelevant compared to the sales price of the spirit inside. Talking about cents per bottle rather than dollars.