Zardnaar
Legend
You're the one talking about quality, not me. But, I find it hillariously funny that people keep harping on about how bad this module is, and how WotC must do better if they want to be successful, yet, this apparently bottom ranked module is making money for WotC hand over fist.
Funny how "good for the consumer" is yet another way of saying, "this is something I don't like, so it must be bad".
Hand over fist might be an exaggeration. It's sales fell off a cliff after a few weeks. Newer product isn't selling as well as the older stuff. At least the adventures. Bad word of mouth perhaps.
The income might be hiding it gee they're still making money but a lot of the big selling items are older product and rereleases with variant covets.
Sort of the Magic the Gathering approach. If you want to sell lots stick a dragon or vampire on the cover. Or player option books.
Culturally they may have peaked a couple of years ago now they're playing the greatest hits
Xanathars to Theros was roughly peak 5E quality wise for me ymmv of course.