The value of bitcoin is more about the sentimental value people attach to it ,not necessarily as a result of its functional prowess.Bitcoin cash can basically do all that bitcoin itself does but it sells at about a tenth of bitcoin price.I also argue that bitcoin 'deserve' that exclusive right since it is the first crypto-currency. Much same way Gold is in the world of precious metals(silver has more uses that Gold but the price is never at pal with Gold).