We tried something like that on guru (very old forum software) and it only worked if no one else posts in the 24 hours between when the OP can post. If someone else posted (to bid) then it ceased to function. We are looking into seeing if there is a way (now) that this can be done. We have much newer (and better!) software than guru did (ok, that is not saying much since guru started in 2003....).
We have already added the resolve feature so that you can now basically say you are done with your thread by marking it resolved, this will keep you from having multiple threads active at the same time (another big Xunlai Market rule). Any thread marked as resolved will essentially be seen as no longer needed and closed by a moderator.