Classic on the cusp?
Not many 4 door saloons make true classic status, it is nearly always the coupe / convertible versions. The QP is no doubt a bargain, such a lot of car for so little money and they should be getting close to becoming depreciation free but it will still, like most modern Maseratis, be a select few enthusiasts choice.
I love the QP 5 and was really tempted to buy one instead of the Spyder but it would have ticked a different box.