Once TVs moved from the mature technology of CRT to the immature technologies of LCD and Plasma, purchase of a premium TV was a financial gamble.
The history of the BV 7-40 , with it's ever improving PQ, is a case in point.
Who would buy a second hand early model knowing it's PQ is inferior to that of not only later iterations, but a current TV from one of the major manufacturers?
Now that LED TVs incorporate a relatively mature technology, a case can be made for purchasing a second hand late model B & O TV, or a current one such as the BV11 which had, in a review I recently read, the best 'out of the box' performance, particularly PQ, of any TV they had recently tested.