I agree with your vision, giving without expectations will help you feel a lot better and enjoy life more. That would also immediately contradict the giving without expecting anything in return; hmmmm, does not make it easier.
What I've found is that even if you're sticking to this and give/do/act without wanting or expecting anything in return, other people start feeling obliged to do something. It seems extremely difficult to believe someone can do something out of the good of their heart.