There's a lot of things about Zoomoth that make them essentially the perfect storm of collectible keshi. They are a small independent company, and because so, every figure has a visible artistic style. You can sort of tell a Zoomoth figure from other keshi. In fact, it is said that one of the original sculptors on the Neclos Fortress line is now doing Zoomoth. They also do a lot of video game characters, from Castlevania to Metroid, and even Splatterhouse.
Something called 'one-day licensing' has been all the rave in Japan and for good reason. This is where a company sells the rights to use the likeliness of one of their properties, but they can only sell the product for 24 hours. After that time, the contract ends and they no longer can use that IP. This is perfect for small companies like Zoomoth who look to attend short events like gaming or toy conventions, so they've made it a custom to have a very limited edition keshi available only for that convention.
The figures they release during these conventions are sometimes the most coveted in the keshi community. Sometimes they are in such small batches, there are only 30-50 made in the whole world. The price they demand is a bit out of my reach, but I think eventually, I will splurge for at least one. Or heck, maybe even wait in line in Japan someday for one