Everyone will say scarcity is expensive, the gold is scarcity the same as the bitcoin.
I can't find the reason from the gold valuable.
It can't do anything worth thing...
If you dont think that gold is valuable then dont accept the fiat money that would be given to you. I believe that bitcoin and gold are valuable in terms of finance, the only difference is their supply. Bitcoin has only limited supply while gold has a vast of supply that is circulating all over the worl and accepted by all nations unlike bitcoin which is only accepted by those who really understand cryptocurrency.
All is need the time , the bitcoin will beyond gold to make people to accept it.