You could say that for any marketing activity. You don't expect a hotel to add an additional fee for the fact that you seen an advert in a glossy magazine, or f

You could say that for any marketing activity. You don't expect a hotel to add an additional fee for the fact that you seen an advert in a glossy magazine, or for providing their own website for that matter. I'm sure you are aware that the entire travel industry, predating the advent of OTA, works on a commission basis.