I reached the same conclusion many years ago. My jaw dropped the first time I heard a Dynavector MC with an ARC step up, it was far better than I expected it would be, but to be fair it was also a fair bit more costly than a top tier Grado. The MC preamp alone was 2k.
What do you think the top Grado costs - the Statement Reference?

I recently saw a price of USD3,500!
This is only 0.5mV output (so you need an MC phono stage). And btw, it's no use using a SUT with it - as it needs to be loaded with 47K (that's according to Grado; I wouldn't be surprised if it actually sounded better at 33K.

).
Andy