I have always had playdays for my DS(6) friends in the holidays, ranging from one friend to "parties" with up to 6 friends but after a distinct lack of return invites I decided no more!!
But now I'm beginning to wobble, DS is asking if x and y can come over but I just have such a lack of enthusiasm for it, some of the children have one parent who works full time so I understand that it is difficult but really AIBU to expect an invitation in return, I think it's good manners but maybe it's ok not to reciprocate and just expect your child to play at other peoples houses.
I'm really trying not to get annoyed but it's hard! Whenever DS has gone to other peoples houses the parents always say he has been good so I'm fairly sure it's not because he's badly behaved.