Still the English paid for Joan of Arc 10,000 francs. Compare that to the price of a horse which in those days was from 10 to 12 francs. The average horse today is about $1000. So in today currency he paid about $1,000,000 for Joan.
She was a threat to English rule in France in a way that the English recognized.
I have a great sympathy towards Joan of Arc I should mention. In fact if we consider her mission as valid [which I do] that would mean the French were wrong for getting rid of the Monarchy.