I've had troubles with deleted threads but that was with some other bag of tools...

I think that they should delete threads that don't have pics. But give people just a little bit more time before you toss them out. Typing long for sale posts only to have them deleted is a bit frustrating.

My suggestion is to have a 24 hour period from the time of the thread creation until the time that you delete it.

The reason I suggest this is for a few reasons.
First, some people post these threads while they are at work and want to get the ball rolling on their for sale post but can't drop work to go take pictures.
Second, some people don't have access to a camera at the time and will have to borrow one from someone but still, as in the other one, want to get the ball rolling on their sale.

Just my input...