If you have been through 17 sets already then surely you have plenty of empty bottles to re-use and use the cartons as refills like they are intended.
The eco friendly line as you put it is just one of the many reasons that the change was made, reduction in plastic, massively reduced carbon footprint for transport, production, and storage, and also scaleability for production. We make all the products ourselves in house, we do not just get a company out in Eastern Europe to create the products for us and stick our name on it like other companies do, that way we can gaurentee that our products are of the highest standard, with that said with the ever increasing demand for the products there was no way that we could produce enough product with the old packaging as the storage requirements for the empty bottles alone were bigger than the whole facility! The new packaging has enabled us to produce a lot more. As for profit margins you can see that we have already dropped the MAP in Europe and the rest of the world will most likely follow in the future once importing overheads are reduced.