The fee is indeed impressive; powers that seem magical even to a man of the twentieth century, who has killed men at five hundred paces and lit a room with the flick of a finger. Manipulation of forces unknown to human science; with these 'spells' at his fingertips, perhaps he could finally meet the Jackal - or its home civilisation - on its own ground.
And again he is reminded of his last speech to the Jackal, the one that ended with her teeth in his throat: Tell me, did you ever consider using anything but force and fear, to accomplish your goals? Did it occur to you that, with your superior knowledge, you could pay in education for the metal and labour to build your spaceships?
It appears that Abadar has considered that, and has come down on the side of trade, of comparative advantage and value for value given. Abramo appreciates that. But the question remains, what is the service Abadar wants? It is not well to sign contracts with open-ended consideration.