Bought and sold dozens of items on ebay, though nothing over $2000, and that was a new item from a power seller. Only had one buyer back out on a $400. lens, and sold it on the next try.
Big ticket items are a different story, and I, too, would never buy something like a vehicle sight unseen.
Had very good luck w Craigslist, too- especially with buying equipment like cameras and printers that I didn't want to risk having shipped.