10K RPM hard disks

I would like to have a 10K RPM hard disk in my workstation. IT would speed up compilations and other things that reads a lot from disk. But the 10K hard disks are still very expensive. Why?

A 250GB SATA-disk 7.2K RPM and 16MB cache cost 395 swedish kronas. Just over €40. The cheapest 10K disk, which is only 75GB, cost SEK 1095 or about €116. 75GB would be enough on my client. But why three times the cost of another decent disk.

It is not that I can't afford it. Just that it is more fun to by a 1TB-disk or more RAM for those money.

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