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Gosh. Any explanation for the sharp upturn?
In the past few years, Scott (and the other major worldwide catalogs) finally got around to adjusting the price to reflect reality.
This set marks the early period of the Cuba-based printings. Most are readily available mint -- but this set is one of the exceptions. Looks like few post offices in Laos received any supplies. Some were sent to the US and Canada, so there are probably a few old-time new issue dealers sitting on some. I don't know the print run, nor the reason for the limited distribution.
If you think the mint stamps (no gum as issued) are hard to get, try getting an FDC (they do exist) or a used set (genuine postal usage, not CTO).
The delcampe seller linked above is known for actively trying to buy this set in previous years.