Duh. Nobody is using cryptocurreny in any significant quantities except criminals on the dark web. The only thing sustaining value in cryptocurrencies is investment speculation.

If investors cannot sell shares then there is nothing left for it. Investors must be able to advertise interest, any way they can, to entice other people to buys their shares otherwise it is just a retail souvenir.

EDIT:

I can see this post is irritating people. Please respond with an example of people using cyptocurrecy to make legitimate purchases in any valid quantities.