The additional owner fees started over a year ago and apply only to NEW owners, as described below:
Beginning in September 2015, bookings by new account holders are charged a service fee amounting to 5-7% of the booking total.
Services booked through a Rover account created prior to the date the fee was implemented will not be subject to the owner service fee. The fee cannot exceed $25/booking. It’s fully refundable should the booking be canceled by either the sitter or the owner prior to the first day of the service, in accordance with your sitter’s cancellation policy. If the booking dates change, the fee will be updated to reflect 5-7% of the new total.
https://support.rover.com/hc/en-us/ar...