Yeah, it’s an estimate (clearly it hasn’t all happened and been tailed up yet) but reasonable. Plane tickets are close to 700 bucks (because we’re driving 2 hours south and leaving at 6 am. Flying from the nearest airport would have been over 100). Hotel room is 200 a night with tax — for 3 or 4 nights. Rental car or taxi (the hotel is an hour from the airport). Tux rental. Eating in restaurants in a tourist town.
I’d rather over estimate and be surprised than expect it to be cheap and not budged around the real cost.