You can get 3000Mhz RAM for $500. This specific model, along with what eduello said, is just overpriced. I bought my RAM for $20 and now the same exact model costs $150. Imagine this on a larger scale. Some products get marked up stupidly high which can be due to many reasons, the most recent being the China factory fire (which was the cause of my model spiking).
I'd say there's a combination of being ahead of its time, getting marked up due to production issues, and diminishing returns. Sometimes products exist just because they can, such as $40,000 crystal-encased speakers when you can get the same quality for $1,000. I'd say that's whats going on here. When you sell the fastest RAM on the market you can charge high prices just because there are going to be a few people that buy it just because they are tech-savvy and want bragging rights.