I wouldn't go either...thankfully I haven't been invited so far! In fact, I am thinking it may be something to add to the good old contract...so parents can read about the reasons ahead of time and not even have to invite you. I think sometimes parents invite us because they feel it is polite and that we may be offended/hurt if they don't. I remember being in the position with my son...wondering if I should or shouldn't invite his daycare provider. In the end I didn't, but felt kind of bad about it.