Why do coffee shops hide napkins behind the counter?

Posted by OrdinaryIncome8@reddit | AskUK | View on Reddit | 35 comments

Chain coffee shops such as Costa and Pret tend to have all kinds of things for customers to pick freely: sugar, stirrers, spoons etc. However, usually napkins are not, but must be requested from the staff instead. Why is it so? After all those are similar low value items, and staff is always happy to give bunch of those when asked.