I don't have any experience giving samples away to customers for conversation to sales but am posting to tell you what I, as a consumer, feel when I receive samples. Most of my samples are from places like Sephora, Estee Lauder, etc., where they will give very small samples. I don't even know how much are in these little packets. I've received lotion, serums and other products. 9 out of 10 times, I will not go back to purchase the item because they did not give me enough product to figure out if I like it or not. Lotion in a small packet barely gives 1x use with rarely enough to do arms, legs, and feet. Serums get maybe 1x use and that doesn't tell me much either. Not sure if that is the answer you were looking for but hope it may help some.