Well, count me in among them. I don't really see a problem here, and there is nothing really anyone can do. Yujo earned his biju and selling his account is a valid reason to not fight Luka. However, let it be noted that Yujo is selling his account AND biju. This means that someone else will rp as Yujo (similar to Rakudo) and still be responsible for the biju challenge (They don't get a new grace period)
Basically, people selling their stuff hasn't ever been an issue and this is really nothing anyone can do or say about it. Yujo is selling everything, so unless the new owner of Yujo transfers the biju, Luka is still first in line for a challenge and without delay.
And slightly off topic, I don't think this warranted a new thread. Seems a bit rebellious and rather rude to deny a mods wishes and open up a thread that was just locked. I don't think the Camel was solely swayed by someone simply telling him to lock a thread (Just an assumption though) If anything you could have requested it be unlocked like I did with Edo Tensei. Just my two cents on that though and off topic, so I apologize.