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Only for those who cant take risk. and I dont see any risk in investing in bitcoin. I wish i had invested in bitcoin last year June. If you are thinking where to keep your retirement fund crypto currency is the right place.

Yeah, the risk obviously doesn't bother me either, I would like to add, that if this theory of mine about risk tolerance is true, then all this talk of a bubble is definitely wrong, bubbles will take everyone in, not just those inclined to endure risk.