Because plastic bottles are way cheaper to make than glass bottles, and also lighter and thus easier to haul around in bulk (not to mention that plastic doesn’t break the way glass does). This means that for the end consumer a drink in a glass bottle is always going to be more expensive than the same drink in a plastic bottle.
Unless, say, plastic production gets taxed into oblivion, but then we all would just have to contend with more expensive drinks altogether.
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