Shipping and storage costs. Buy a warehouse full and it gets significantly cheaper but still not the actual cost plus profit. The resin and oxidizer requires storage containers and dedicated specialty tankers, has a shelf life, will actually "go off" after a while.
Even if you build a boat, you don't consume enough to make much of buy.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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