Also, I never understood the appeal of Fiend-Pacts, that just screams "bad idea". The other ones may see you as an amusing distraction, but fiends want your soul.
There are several reasons why someone would make a pact with a fiend... out of desperation (prime example: Wyll), out of laziness or pure arrogance or by getting tricked into signing the pact.
And the time when the fiend claims your soul is far in the future, so plenty of time to wriggle out of the pact... or so they believe when they sign the pact.
Actually I find it far more difficult to grasp why someone would form a pact with a GOO. They are too alien to really fathom their motives, at least with a fiendish pact you know where you stand.
