Looks like another bump of this thread is needed.
Yes, I personally go in and undelete the content from every Trading Post thread where the member deleted the content of their original post. If you don't want the information seen once the item(s) has sold/been traded/withdrawn, DON'T POST IT IN THE FIRST PLACE. Leaving the content helps other members who are looking to sell/trade or purchase similar items to get an idea of what the market is for said items. By deleting the content you are doing a dis-service to fellow members.
I'm quickly nearing the point where repeat offenders of this will receive a 10 day suspension of their TP privileges (for starters). After all, we're first and foremost a discussion forum and community. If you don't want to show consideration to your fellow community members on your own, we will help you think of them the next time. The rest of the staff and I grow weary of having to constantly make these reminders while showing some kindness and not taking punitive action. Don't expect this to last much longer.