I work full time, am single and have no family nearby. I invite DD's friends around to play and due to work, this is always at the weekends. Usually I will take them to some activity (park, swimming etc) and more often than not it becomes a sleepover.
Here's where I'm being unreasonable. Nearly all reciprocal invites for DD are after school. It annoys me that I don't get the 'benefit' of not having DD here. Don't get me wrong DD is the most wonderful child ever but sometimes it would ne nice to have a sunny Saturday where I can just chill reading a book.
So I know IABU thinking that if someone has had your child for 24 hours then you should do the same.