Budget staff at Seattle airport uses some manipulative tactics. First, they ask about the number of people and luggage, then tell you that the car you booked is not available and suggest you upgrade for double the price. After refusing, the staff claim the price includes full insurance and advise you to sign electronically to save time. If you trust them, you may fall for it, as I discovered the next day that they had added duplicate insurance, which cost almost as much as the car rental.