They may simply have sold it to the first person who responded, and ignored the rest of the emails. Why answer a bunch of email about something you no longer own?
I have gotten a couple of good craigslist scores by responding early and offering to pay a little more than their asking price and pick up the item (or have a shipper pick it up) at their earliest convenience. They say, "Hey, he sounds like a nice guy," the deal is immediately sealed, and everyone goes home happy.
A couple of other hints:
-- If it's something
you really want, keep your trap shut until you make a deal (don't blab all over international forums like this).
-- If the seller includes a phone number, call them immediately rather than sending email. Lots of people selling online are not Internet geniuses, and may check email sporadically or simply space out on things.
Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html