I'd hate my child to come home with one of those party bags, suedonim. What on earth do you do with a surprise baby rabbit?
IME birthday parties can bring all sorts of social tensions to a head - who you invite, who you don't and who decides to come, especially when the children are younger and parents have to stay. A friend and I fell out twice each time around the time of my son's birthday party, once when he was 4 and again when he was 8. At his 4 years old party, I did a double whammy and also managed to fall out with a close neighbour and her uninvited and much older child, too. Just don's ask about that one! I am honestly not a falling-out-with-people sort of person. I have only fallen out with a couple of other minor friends in my entire life.
My son had a megabowl bowling party last year for his 9th birthday. I hated the noise, but steeled myself in advance and insisted dh was there. We only had 8 children in total and they were mostly well behaved, considering. It was not that expensive, comparing the prices of some parties (yes, agree that traditional home parties can be very expensive). This year we will have an outing. I tend to alternate between outing and party each year, but have never yet had a big party at home and will duck out of this forever.
Two things annoy me about party guests - so few say thankyou and some of them are so grabby - where's the cake, where's my party bag etc etc and even their parents don't say thanks when they whisk them away. In my day, you would always say a thankyou to the host.
Also, two of the boys my son invited didn't give him a present or a card. OK, not carping about that, invite doesn't equal present - but in each case their parents stopped me and aplogised. They said they had already got a present for him but had forgotten it and would give it to him later. The parents as far as I know aren't particularly hard up and it's not as if they have spend more than a couple of pounds on a book, but six months later nothing from either of them. To my son it's a broken promise and I don't like being lied to.