It hurts the customers in theory becuase the lower price means that Dayan/Mf8/Who ever don't get as much money from profits, ......
The supplier/manufacturer sells the cubes to the vendors at (I assume) the same price for all. How much those vendors charge and what profits they decide they want to make is up to them. DaYan still gets the money even if lightake decides to give them away for free.
Edit: Fiftyniner beat me to it.
I think the main factor here is that Calvin is not only the supplier, but he has his own store selling cubes. By controlling the supply of DaYans, he has a conflict of interest. The less cubes the cheaper stores sell, the more profit his relatively more expensive store makes. He doesn't care about the community or the cube designers, he wants money for his own business and is using his position to make as much money as he can.
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