Just as you would be embarrassed to not pay for your child, I would be embarrassed to ask for the money after I had invited a person to be my guest. To me there is no difference between inviting someone to a show, out to dinner, or on a vacation. I have extended an invitation and now it's my responsibility to host you. If I couldn't cover the entire cost, I would not invite you. It's just how I was raised. It appears on this board I am in the minority but in my circle of friends and family, this is how it is.