Buyout the manufacturer Whetsone?

As a seriously interested LT Yowie investor, I've wondered if with the successful placement with the largest retailer on earth and more to follow, and therefore a pretty secure future, wouldn't they be thinking about manufacturing their product themselves rather than sub-contracting? Why pay Whetsone to make the product? Why not buy them out and increase margin? How many shifts could they run then? Seems logical to me. Just saying