I can understand regarding parties that are really for selling things, but this is for a real party with friends. I don't think an evite is any less personal for those who use email frequently. I have to end up sending a seperate email sometimes too, even though I know they have read the official invite. I just don't understand and think it is extremely inconsiderate for the hosts to be left guessing who is/is not coming, how much food to have, etc.