Hi,
yes I know what u mean this my biggest concern because u see I want my place to be cozy, I don't want the customers come in group unless they just buy and take coffee and leave without disturbing the reading-in customers, so these some of my concerns:

* How do I charge the read-in customers (not buying a book just reading-in) especially if they did not ordered coffee or just have one and set there all day!!! (by book, by hour, ...?)
* How can I make the groups to stay less (hopefully after one coffee serving) and not to disturb the reading-in customers.
* if the customer buy a new book and wants to read-in without ordering a coffee, should I let him. (I have old books to read-in or/and buy, and new books to just buy then they can read it in)