PLEASE Change title to SOLD

Hi -
Opportunity for improvement (translated - minor rant)   It would be helpful to have forum guideline as a sticky at the top, specifically it would be great if folks would EDIT their posts and change the SUBJECT to say SOLD when an item sells.

It's a small thing, and many already do this, but it really makes it easier to 'shop' - and spend less time reading through posts for items that have already sold, which is fascinating, but a bit of a time-waster. 
Thanks