Let's bring it into the real world would you like to choose a professional medical doctor that treats and takes care of patient in the hospital or like to choose someone that got know skill and has nothing offer or economic value?.
Therefore, this is to say value comes from problem solving, Bitcoin solves the decades problem of old monetary system that is inflationary (money printing), centralized and non transparent system. While Bitcoin is deflationary , limited supply/Scare (only 21M Bitcoin can ever be in existence), decentralized  and a transparent monetary system (all the transaction from the beginning are there to see). Therefore a (ll this problems put together makes which Bitcoin solved valuable