Not really cos I don't enjoy having them at my own place to much preparation and packing away! Never as much fun at your own do. Other than that I don't think you need a reason. The reason is just for fun!
I guess this shows how much of an loner and introvert I am, but I don't really do parties. I don't host them, I rarely attend them, apart from family get togethers. I guess that makes me kind of lame, but I am who I am.