Oscar,
You may be mistaken... Most, if not all, Musang Kings that you come across in the US originate in Malaysia. More importantly, these durians are NOT harvested like you would a mature mango, i.e., picked/cut from the tree. Instead the durians are allowed to ripen on the tree and dropped (without human intervention). They are then collected and processed (flash frozen in liquid nitrogen) and shipped. Thai's do NOT like smelly durians--Malaysians, on the other hand, love the pungent aromatics of their cultivars. It's a dramatically different harvesting practice between Thais and Malaysians.
When ripe, the sections of ripe durians also tend split open fairly easily, especially at nose, which will desiccate the arils. The exporters circumvent the splitting tendency by rubber-banding the nose end of each fruit. Of course there's always going to be some loss in quality when you ship frozen fresh fruit to faraway places. But the eating experience of a thawed Musang King exceeds all expectations when compared to a Monthong. For some (like my wife), it justifies the price difference between $4.50/lb Monthong and $13/lb for Musang King in St. Pete. Mind you, I've had very good Monthongs in Thailand (per my tastebuds) when i can find tree-dropped (ripe) fruits, but these are extremely difficult to come by.
ps. Note the green rubber bands keeping the sections intact. The smaller vacuum-packed and frozen box is relatively cheaper at $24.00 per box.