But those costs will be passed onto whoever's buys their bulk products, who will then un turn pass the cost down to the end of the chain - consumers. It just makes everything cost more for end users still.
This argument fails the basic economic sniff-test. In such an environment where packaging waste is taxed any business that can figure out cost-effective ways to reduce the waste footprint of their product gains a competitive advantage that they can use to either increase profits or pass on the the consumer to gain market-share.