To delete recovery questions...
"Go to "Recover a lost password"
---> "Some Else Knows My Recovery Answers!"
Fillout the recovery process, and use the Tracker ID thing. Please note that if you did not create the account yourself, there may be a possibility of it getting locked (happened to my level 81 and 76)
Also, buyers, be aware. Even if an account does NOT have any recovery questions, or new recoveries are set by the buyer, the seller can still recover the account.