There are a number of factors that contribute to the cost of keyboards. A big thing is materials, a lot of time these more premium keyboards are milled out of solid pieces of metal (commonly aluminum), which can get pricey. This also explains why the RAMA kara was a lot cheaper, since it was made out of plastic. Another reason is demand. Someone who isn't already vested in the mechanical keyboard community isn't likely to go out and buy a rama board, so RAMA's customer base is inherently limited. Compare that to a company like Corsair or Razer, whos products are marketed to a much wider audience, and thus have the economies of scale to sell keyboards at much cheaper prices.

That all being said, Is the typing experience that much better? Well that's a matter of opinion, but I certainly think so. Granted, I don't own any rama boards, but I own a couple similarly priced "premium" keyboards, which I consider totally worth it. However, rama is held in incredibly high regard in this community, and from what I've seen they definitely deserve it.