Every time you receive an inquiry, and more specifically a booking through a listing site you are capturing potential guest information. This is marketing, and yes you are paying for it through the listing site fees. It takes time and money for SEO, content marketing, and internet marketing in general. You should be maximizing everything out of each booking you receive from a listing site. After all, they are your guest! Each guest should be subtly nurtured, from the very beginning of their stay with you that you are the vacation rental professional and they booked with you; not a specific listing site. From automated emails,. Rental Agreements, helpful area information, post-check-out follow-up, and more coming directly from your website; they should have no doubts they can re-book directly with you. Savings for them and you. All you have to do now is WOW them and make them your guest forever.