It's the same as with any other non-fiat currency. consider bit coin mining as diamonds.

everyone is finding new mines and bandits are active on the more remote ones. So prices get crazy. Bit coin will be like that until we approach the ceiling limit for bitcoins.

when that happen we will have the stable diamond market we have today. but limited by the algo and not by some cartel owning all the mines and buying all the new ones that are discovered to keep diamond supply stable artificially.

until then, enjoy the roller coast!