@uberwaltz
One thing you have to remember with vintage mm carts is that not everyone is prepared to take a chance on one no matter even if it is NOS.It will still be 40 to 50 years old. And also the dearth of styli is another crucial factor that puts a lot of people off.No shortage of vintage mm on eBay SANS stylus! For some the convenience of just going with a new readily available cartridge is half the battle.
This is why i have mentioned Miyajima.
BUT
Over the years we had huge topic about vintage MM and almost everyone who ever tried some vintage MM "cart of the month" was so happy about it (tons of feedbacks), so your comment is irrelevant. Yes, some of them are rare, but most of us have/had them all somehow. I want to point you that the most problematic vintage MM cartridge (Technics P100 mk4 or 205 mk4) is notorious for dead suspension, but it was the most popular in that topic and everyone raved about it. It was always the most expensive one and still is the most expensive, i would say overpriced, VdH service was terribly expensive too. People are strange. I do not recommend such cartridges since i tried many samples to make sure it is problematic and not for purists (who does not want to bother with refurbishing). What i do recommend is actually does not have any problem with dampers etc, the rubber in the damper is much better that Technics rubber and for this reason none of them degrades it time (at least we can’t notice that by ears or visually).
Regarding vintage MC everyone knows that FR-7fz by Ikeda has sealed suspension. Nobody never seen a bad 40 years old sample (if it wasn’t physically damaged by someone). This is a proper design for decades, but i want to remind you about some modern cartridges that simply does not designed to survive in time, suspension on such new carts degrades faster than stylus tip. I remember such comments from the owners on audiogon. This is one of the reason i always repeat that high price does not mean superb quality. This is a problem of some modern LOMC, you may think they are better and easy to service, but the policy of manufacturer’s support/service does not even expect service, just an exchange to a new sample (you know this). They are made for reach people, definitely not for everyone.
So everyone can find good and bad things about each type of cartridges (NEW vs. OLD ... MM vs. MC ... you name it).
Personally i would never buy even $2k cartridge for myself anymore, but for some people even $9k is not a problem. There is no universal rules, we can only mention some facts and share our personal experience, but we may have completely different point of views. This is like TUBE vs. SOLID STATE ... or DIGITAL vs. ANALOG ...
My point of view: It is better to buy 3-5 different top vintage MM or a few decent vintage MC than just to buy one $5k modern cartridge. But anyway, this is just my philosophy regarding cartridges.