As someone who has a bit of experience with plastics and molding*, those molds aren't cheap. Most were tens of thousands of dollars to make. (Granted it sounded like in this story the guy made his own molds, but still, not cheap.) We even had a couple that had cost over $100k. And we had a mold designer in house, that was just the cost to make the mold itself.
We would lease production time from either injection or blowing molding companies and had them use our proprietary molds to make our products. When the contract was done, the molds came back (and they are HEAVY as all hell.)
So I've been looking at numbers and I don't see how many vials were in a case. Then I could figure out how much money he made (at $250 per case) selling these.