I still fail to see why a picture of a Glock 19 or a Remington 870 is necessary. State model and condition, problem solved. You're willing to meet a complete stranger to make a firearm transaction but you can't trust their ability to rate the gun's condition? How about asking specific questions before the meeting like "Does it have any faults or blemishes?" It seems like the picture thing is a big PITA for what should be a simple sale of a common gun. YMMV.
Because one persons version of "like new" is different than another persons?
I just think it is a courtesy to post a photo of the item you are selling. It has been proven on eBay and Craigslist that items with pictures sell better than ones that don't. I would be more apt to look over an add that doesn't have a photo. I mean, if you are selling ammo, that would be borderline dumb to post a pic, but guns...hell yeah I want to see it.