Well thats kind of the point of the Question...
If it were possible.
I know there is something in my life that If it were possible, I would, and I also know I have come about as close as I can, to selling my soul.
No I don't believe I sold it, But I have gone to places and seen things, and become a part of....
And I will continue to search until I get that which I desire...lol
Have I sold my soul.. No, not in terms of soul, but.. as far as going where I never believed I would go... I just keep getting deeper.