Did they really expect us to consider that a serious offer?

The Chief and I decided the queen-size futon is just too big for the guest room, so I advertised it for sale.  We bought it new only 3 or 4 years ago, barely used, so listed a price 1/3 of what we paid for it.  We got one person who seemed seriously interested - wanted details on size, pictures, etc.  Then came the counter-offer - less than half of our listed price!  Did they really think we'd consider that a serious offer?  The frame is solid hardwood, and everything's in like-new condition.  I replied "no, thank you."