Want a dakimakura? Sure, pay up 9,000円! You know, everything in Japan is so expensive, but do they really have to milk otaku for that much cash? There's no reason for printed pieces of fabric to have such a hefty price tag. The manufacturing costs of these things are at most $20, and that's if you're just making one and not mass producing. Yes, the material is soft (and differs, so it's hard to give an exact breakdown of this), but they're not weaving gold into your case. Really, the official ones are really similar in feel to the Chinese bootlegs you find on E-bay and such. Those I find priced fairly. If only they stopped picking such crappy artwork for their bootlegs. I assume it's because they're essentially made from the same crap. Really, it's just 2 strips of fabric with images printed on them, sewn together, and a zipper added. This isn't something that should cost more than my jeans.
You can make your own dakimakura for fraction of the price it'd take to buy an official one, but that assumes you want to walk into a silkscreen shop and ask them to print out a loli on a pillowcase. But they're able to sell them at that price because people are buying them at that price. So they'll be staying at an unreasonable level for quite some time.
~ Kirari ミ★