I know this was brought up several years ago but I wanted to suggest it again now that the forum has a gazillion members.
I think there should be a rule that all classified listings must include a photo - ideally with a username and date - similar to what they do on that "other forum".
If it's too much trouble to take 30 seconds to upload a photo of a $500 item then what can I expect when the guy has my money and I'm waiting on him to pack and ship my item? Including a photo makes it much harder to fake a sale and ensures at least some level of commitment to actually sell what they're posting about.
Just my 2 cents.