A lot of people base prices on what they originally paid when they bought the items. So if that TV was $1500 in 2007, they think someone is getting a deal if they sell it used for "just $1000". Plus the TV has worked fine for 5 years, is clearly never going to fail, right?!? Very few people know about TVs or any tech item for that matter, however they will very often believe those items are worth far more than they actually are.
I know a couple people that are holding onto junk TVs from the dawn of the flat screen era because "I paid almost $1000 for that, I am not spending $1000 again". Meanwhile its a 40 inch 720P TV with a broken remote, a failing back light ("only on part of the screen"), more motion blur than a paint mixer, and the TVs have problems like randomly turning off. They could replace the TV for like <$400, but they won't even look at new TV prices and features. Then they go and spend $140 a month on Direct TV so they can watch the hell out of that TV
Eventually those TVs will just stop turning on, then they will buy another one. Until that moment, they are still watching a $1000 TV in their eyes.
As a counterpoint, my aunt recently sold a 30 inch width almost-new Cub Cadet snow blower for <$200 because "its too big". She put that right in the Craigslist ad too, as if to warn people that a 30 inch snow blower is serious business. The ad was just a couple sentences with some pics of the snow blower with the factory stickers still on it. Sold it in less than an hour to the first person that contacted her.