@Hifsa:

... Dammit I cant think of an answer

@DoubleOtaku:

Well then, why the exchange?

@Hifsa:

Good and bad make no difference. Hell wants the bad souls just as much as heaven wants the good ones.

@mangaandanimelove:

That is so evil xD

@DoubleOtaku:

Interesting, but then what about good and bad souls?

I agree with double otaku, the only price a person can pay for a soul is another soul.... Equivalent exchange! XD

Don't try this at home kids. <_<

A soul is worth another soul. All are equal

@Kazamas-Keyblade:

Wow, thats new information, very interesting, thanks for sharing...

In "Shakugan no Shana" the price of a soul is both large and small. I think that a lot of souls (lives) are worth something.

@:

Yes, you're right...