I'd add to the "What's Your Best Price?" query these: "Is it still available", & "Why are you selling".
This may be highly non-PC here, but at least on fee-bay, items usually either sell, or they don't. People may ask legitimate questions, but you generally avoid the endless tire-kicker questions.
Also, I tend not to respond to one-sentence e-mails with no name attached.... just my 2 cents....