I've gotten a lot of the picture-collectors too which mysteriously disappear when you comply with their request for detailed pictures. Or how about the guys that ask "do you have ___ part and how much?" Only to say they're selling one of their own; they just wanted to copy or beat your price. The most aggravating ones are the low-ballers. It's almost always a lurker from here. I'm usually willing to lower the price if it's within reason - which I'll say "this is my absolute rock-bottom price" and then they'll come back with "will you take $xx? (Less than the price I just specified). I've stopped responding to lowballers altogether; it's not worth my time.