to sample or not to sample

does sampling food whet your appetite, or give you enough of a taste such that you don't feel you need to purchase? how often do you sample something, then say to yourself, "I've got to have that", and then purchase the item? the other scenario is one where you are not able to sample an item, you purchase to satisfy a curiosity, and then you decide whether this item will become a regular purchase? does sampling itself create a customer experience that customers want to repeat (e.g. BJs, Costco)? I know the Cheese Board in SF is famous for sampling any of their fine cheeses on demand. Maybe we'll have to try both ways and see what works.