It amazes me how many people will list something for sale on Craigslist without publishing obvious facts like model numbers. There's an upside if you a buyer who compares your price for the used item with the price for a new-but-superior item. However, the downside risk of wasting your time with people who walk away once learning the details of the item seems to outweigh this benefit.

Perhaps the greatest downside is that people like me will determine that the person selling the item is an idiot and apply a discount factor for the risk of even dealing with them.