Regarding the value of the cars. I don't believe any of us know what options these cars had or the mileage. You can pour a crapload of $$$ into a Mosler OR a Porsche, and, while it will bring up the value (a lot), there may not be a market for it. My husband cares more about the options in his cars and making them faster/unique than about the furniture in our house. It's a car thing.
There's a market in high-end luxury cars always. In China, such cars are worth almost twice whatever their worth here. I'd say just my opinion but google--interpol has an an entire report on the markets and lots of discussion and new reports on the various ways in which stolen vehicles, especially high-end, can be marketed.
If a car ring is operating, and they do, sometimes out of organized crime, means and tools (high tech too) are already on board and the usual suspects buy on the black market, or the ring knows where and how to turn over the goods.
In this case, yes, it is a stretch to imagine the alleged perp or anyone behind this horror, had a practical and doable plane to steal the Mosler and raise big money on it because logistics seem over-complicated--get into it, disassemble, take away from scene, store, then ship, possibly have to forge a title, erase and etch in VIN. Yes, there are countries, and Interpol is asking for legislation/regulation on this, that don't check VIN, and where the market works with corrupt enforcement.
So what are the chances? IDK. JMO some dreamer and bungler who thought himself a "master-mind" might have forged a plot revolving around the Mosler, a failed one obviously.
Could also have involved another or other cars or some type of identity theft with a quick pay off before discovery.
None of us know much, but my theory is that a person or a gang who thought they could get away with the crime we see, which so far could be only part of the proposed crime, is evil, amateurish, and has an inflated ego. For such a mind, any plan is possible, no matter how unfeasible.