On a couple of occasions when selling gear, I've had some particularly vague potential buyers. And when I say vague, I mean, either what they say is really not specific, or they are asking specific indirect questions to cleverly try and get you to answer in a specific way. Either way, it's hard to tell if they are genuine. For example, one person called me up expressing interest in an amp I had for sale.. the tone was abrupt, and vague like "Tell me about it". Not being one to beat around the bush my usual answer is "what particularly do you want to know?". In this particular case then the questions that followed were ones that had very limited value regarding old used gear, and nothing to do with actual condition, tone, real world experience or specifications, for example "How much did you pay for it?". That was about the extent of the call but the person still "wants to have a look". Just wondering how people deal with these sorts of buyers? If they can't communicate over the phone in a way that makes them appear serious, how do you know or find out whether it's worth inviting them over to your house?