i agree with jerry. when youve found what youre looking for, or sold what you were selling, just place a posting stating as such.

thread deletion should only be for extreme circumstances and, in my opinion, should only be performed by glypher himself.

one thing to think of. say you were selling an apple and sold this apple, so post saying " i sold my apple"  then poster b comes along and posts" damn i needed an apple" then poster c says" hey, you can buy my apple" therefore, even though you were finished with the thread, it still proved to be important for someone else.

so i think you should just post that your item  was bought/sold. and if no  one else ever uses your thread, it will just fade into obscurity.

my thought on the subject,

J.T.

or you can "lock" the thread.

duh.