That’s a ridiculous price for a site with very limited functionality, and poor moderation.
It's a ridiculous price for a forum full stop, it is kicking the can down the road of a whole host of issues, some are already hinting at wanting special privileges to highly touchy subjects and inferring a preface of "if I subscribe does that mean x discussion can be suppressed", that will only increase with the paid user base(and we have seen how out of touch MN has been politically for over a decade).
It also not MN offering the support so the sycophantic users who openly have pledged support is irrelevant, it is the posters who are doing it for free, just the same as they are on other forums, they are hosting a platform, it's a business decision first and foremost, and one that looks as though it has been on the cards for some time.
This is nothing more than a disguised go fund me with added caveats of some at the top wanting to cash out.