I already have my mount only to get three more, BUT I did NOT sell them because I know SE will eventually make them tradable so I can give my extras away to the people who have no luck.
RNG is just being very cruel to you is all, don't give up.
I'm still playing Eureka because I want my Emperor's Hairpin; many players were lucky to get one except for me (some have multiples of them in their inventory) X[ I WANT MY HAIRPIN, EMPEROR OF ANEMOS!!