I tried these and I got a headache every time I drank one and so did someone else I know.
If you don't mind, let me know if same happens to you.
At first I thought it was a me thing, but then someone else asked me what in it would give them a headache and I'd never mentioned it to them that I tried it and that happened to me, so it got my curiosity up.
They're definitely losing money selling them at that price, so they're either trying really hard to get people to try them, or they're just trying to get rid of them.