It's not a mistake to forget to apply a surcharge in my opinion. The "mistake" was that they underpriced the market, as the booker hedged their bets on the two

It's not a mistake to forget to apply a surcharge in my opinion. The "mistake" was that they underpriced the market, as the booker hedged their bets on the two weekends. A "mistake" would be $1 instead of $1000 which is the example in the TOS.