the logical inductor sets prices on sentences between 0$ and 1$.
"Buying a credence" (I think) means that you hand the inductor as much money as the amout the inductor asks for it and the inductor promises to pay you back 1$ if an observation occurs that confirms the sentence and 0$ if an observation occurs that falsifies the sentence.
So if an inductor has a high price on a sentence (a high credence), then that means the inductor considers it likely that the sentence be confirmed at some point in the future.
Personal note: the inductor might not immediately realize that a sentence has been confirmed even when it has according to someone with unbounded compute. Would the inductor refuse to immediately pay out in such cases?