Shipping split orders, efficiency opportunity?

JerseyFrank thought this was worth mentioning said

I ordered 2 Day-0 shirts (Me say Daay-ay-ay-0). I placed two separate orders. 1st shirt arrived yesterday, and the second shirt will arrive separately. There's an opportunity there to lower your costs by consolidating multiple orders placed by the same person on the same day.

With VMP, I have no incentive to batch my orders for the day. I want one? Bought. Wife wants one? Bought again.