Perhaps a likelier thing is that hell would be a downward karma spiral, resulting in no return, ever. The purgatory would be simply having to continue with another new earthly life. Heaven, of course, would be Nirvana.
The guys who sell their souls to the purgatory would be those who add another life to their burdon. The ones who sell their soles to hell, would be adding an infinity of such evil. ... And for each and every life on earth, there would be a necessity of solving one problem that one is obligated to find oneself more or less involved with creation of, and that one would not stop without the very rough earthly life.
