Mercury’s patronage of doctors…may seem a little odd, but until recently most medicine consisted almost entirely of charlatanism, quackery, placebos, convoluted explanations and excuses, huge bills and rapid exits. A fair bit of it stil does, both in its conventional and alternative modes.
The connections between Mercury and opportunism of all sorts is real enough, but this way of connecting them to medicine over-emphasizes them. There is a lot more than opportunism and trickery to Mercury. Digging into the quote just a little, there are two points I want to address: one is a matter of tone, the other of substance.