VRBO Service Fee AND Booking Fee?

[Leigh Ann Smith]

We've been using AirBnB for a year but just listed on VRBO yesterday as a pay-per-booking property.  I got an inquiry this morning for a 2 month stay.  She wants more of a discount, which is fine, but I was shocked at the fees.  If I charge her $900/month, there is a $101 service fee + a $47.50 booking fee (for 1 month).  The booking fee is part of the quote, so it looks like that is a fee to her, but I thought the booking fee was our fee.  It's 5.3% of the total.  Her service fee is 11.3% which is already pretty ridiculous.  Can anyone explain to me what's going on here?