We have a B&B style house with several rooms. We have double & triple rooms & we provide lots of amenities (food, toiletries, laundry, etc) that cost us a certain amount of $ each day. I want to be able to offer the room at a reasonable rate for a single guest, but also be able to add a small amount ($5/night) to the nightly rate for each guest after the first person to cover the incremental cost. I also want to be able to add a large fee ($50/night) for "extra guests" so that if someone makes a reservation for 2 people & shows up with 4 people, I am compensated for the inconvenience & the need to figure out what to do with them (ie: give up another room).