As words go, very few utterances get a businesspony's attention like 'free'. And making a profit on free? All Mr. Rich has to do is ask his cashiers to discreetly slip the same sample item into every customer's cart, one sample per day, and Barnyard Bargains will get paid for that. Because the marketing company wants feedback on the new products, and that means getting them to the public.
And the public has feedback. Lots of feedback, especially when everypony is getting the same sample, every single day, whether they wanted it or not.
The public also knows where Mr. Rich's office door is.
Now with author Patreon and Ko-Fi pages.