" why make pacts with demons" video

Regarding the “why make a pacts with demons video”. One question that goes unanswered is what they possibly want? There was some mention of mostly they want to see you ascend but are the really gonna " haggle" with us for lack of better term. EA actually mentioned a pact with Lucifuge in the “lucifuge pays me a warning” video and said then he appeared before me at the crossroads and said he (lucifuge) agreed- this implies that no prior evocation was done so that said how do we know where to start?? Brings me to another question- how the hell do you write a pact in blood (which I have no problem with as I use it all the time for sigils but have same but I have the same problem with it) without the blood just crusting up and falling off? Thanks