If i produce bottled water i buy water bottles and fill them with water. Why do i not buy plastic and make my own bottles? Why does it not actually save on costs from paying another company and taxes from buying/selling, and also possibly transportation?
Because there is someone out there who knows better how to do it and can do it cheaper than you. Also more machines, more staff, more space. All very costly things that come with additional risks attached. In short, leave it to the pros if you aint one.
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