I am sure Q and the companies in question "bake in" a certain number of samples, for PR purposes and testing out...but they do add to the overall costs that are always passed onto the customer.
Regrettably, with most PR now only possible on social media, all the in-house "influencers", the presenters and guests, will have received them even if they won't be presenting on air. I'm inclined to believe posting a few words and pictures will cover them off for that use. Alongside that, their other full samples will have been sent to any influencer with a big enough following, as well as more traditional media outlets.
It is a good business move for Q and the brand, but I do think it hurts us, the customer, in our wallet.