Nobles are supposed to be snobs, willing to spend money to outdo others , and using the best, the premium material. And yet, here these noble ladies are buying their bad tea from the same shady place, not going to the best store that openly specialized in selling reasonably priced, excellent tea, and even gets a Royal Warrant.
Right.....
Methinks the problem lies not in the shady merchant.... Those ladies deserved their stomach pain.