Kangaroo Feathers
Yea, it is written in the Book of Cyril...
Back in the day I worked on some very technically advanced weapons/targeting and coms systems (all now obsolescent at best). That was a generation ago, and I have no doubt the current TOTL gear is an order of magnitude more complex and temperamental. There will always be a certain value to reverse engineering technology for the engineering and materials science, but I'm pretty confident most of the really technical stuff is sufficiently "black box" that it is of limited value to an OPFOR if captured. Apart from anything else, a lot of this stuff "dead sticks" without appropriate authentication procedures, and that's before we discuss how quickly it will degrade if the proper maintenance schedule isn't maintained. Ask any soldier from a technology dependent corps, (armour, aviation, sigs, etc) and they'll tell you, loudly, they spend >50% of their time on maintenance tasks just to keep the equipment running. It's a bit of an in joke among the Afghan vets I know that the Taliban have spent all of their time since retaking Kabul on Quora and Reddit asking for tips on how to stop a Black Hawk from spontaneously disassembling during start up.One would hope. It's actually hard to be certain, based on what I've read.
To be clear, it's not generally an issue around the weapons themselves (unless they went and left a squad of stealth fighters on the ground, which I'm assuming not).
Rather it is the weapons systems, guidance systems, etc. The US will commonly fit different levels of complex electronics to the same basic vehicle, depending on who is using it and where. Their best stuff is effectively reserved for their own troops, and the closest of their allies (even Australia commonly has trouble getting access to this, although purely from memory, Israel has in the past).
So...it's not so much 'is this tank worth money'. It probably is, but it's not going to feed the masses. But if the electronics, etc, are fully specced, countries like North Korea would certainly be interested.
TL;DR North Korea and others are probably interested to have a look at the stuff left behind, but the actual likelihood of recovering any major technical intelligence is probably overstated by various pundits and doomsayers.