[Christ]

My take on it is that while it would generate shape-induced positive lift, it wouldn't have been enough to counteract the weight of the vehicle. Also, you see those diffusers on the rear tail? They're there, IIRC, to ensure stability of the vehicle by piping the lower airstream directly out the back, rather than letting vortices form at the tips of the transition, which would cause mass instability and oscillation.

Reference the wing tips of F1 cars for an explanation of the vortex that occurs on edges which separate high pressure areas from low pressure areas, I think you'll find it interesting. There's a link in this thread (probably 2 pages back or so) that has F1 stuff on it, I believe it discusses the occurrence in enough detail so that the average layman (not saying anything about you specifically) could grasp a good understanding.