A few years ago someone posted a restaurant grade pellet smoker on Craigslist for $300 which was less than 1/10th of new. I responded to the add multiple times and never heard anything back. A month and a half later they finally got back to me... LOL! I have been cooking perfect brisket ever since.
Even farther back my father responded to a Powermatic 71 12" table saw for $1. When he got there the guy even loaded it on his trailer for him and threw in the Biesemeyer Commercial Fence for the $1. It took us a good 4 months to restore it but I still have it.
Then there was the time that a guy posted a $800 Jepson 9421ND 10" metal cutting mitering dry saw in new condition on Craigslist for $100 and wanted to meet in the Home Depot parking lot. I called the cops on that guy, then gave the cops his license plate and the saw serial number after I bought it. After a new blade it does a fantastic job of cutting perfect angles in angle iron and box steel! I never heard back from the cops.
You just never know. I have had my share (at least my share) of no replies also but sometimes you just get lucky! Of course most of those too good to be true deals are just scams so you shouldn't waist your time calling on them... I will take care of that for you!