[1000 silverlings]

It looks like filthy lucre was the sole reason

matthew 26

14 Then one of the twelve, whose name was Judas Iscariot, went to the chief priests 15 and said, “What will you give me if I deliver him over to you?”

And they paid him thirty pieces of silver. 16 And from that moment he sought an opportunity to betray him.

[Dr. Eckleburg]

It looks like filthy lucre was the sole reason

Of course that was the reason. It's right there in black and white. And yet even then, Rome has to fabricate foolish, superstitious excuses for Judas' betrayal.