Economics of scale.
These are for the Chinese market, not America.
The population of America is 342m people, if 0.5% of the population collects toys, and 0.5% would be interested in a blank body you buy upgrades for, if the intended kit 10% of that half percent-of-a-half percent of the population you’re looking at 850 sale which isn’t enough to justify mass production.
The population of China is 1.42b people, same numbers (10% of a half percent of a half percent) you’re looking at an audience of 3.5k, and since most limited runs are 2k or less that’s a pretty large audience (especially since you’ll still probably sell a few units to foreign markets)
… that said this is like Chun-Li overload. You got the official Jada, Stom (both scales), 52 Toys, Revoltech, the 3rd Party Quinn Lee, the Whale Works blank with the Chun-Li head, and 5k just put up different Chongsam for a different battle costume Chun-Li…
But THAT said this one kinda looks like an anime version of Ming Na, soooo… hmmmm