I dont think cost always comes into it - or always has done. I have previously been refused air travel which worked out cheaper than the rail standard class equivilent. I think it's more to do with satisying one party that they are better than another on preconceptions. If being dragged by your arse from London to Glasgow by a Nissan sunny became a fashionable / suave way to travel then you could bet only Lt and above would get it whilst the other scrotes would have to endure the train!