Have you actually read the card,
@snowathlete?
I said earlier (twice) that it's up to any individual whether they sign the card and I'll say it a third time now but I hope that people are actually reading the existing messages first to see exactly what it is that they're signing up to.
The recipient of this card is going to read it from start to finish like a document, and your message and your name are going to be a part of the whole thing.
If you haven't already, take a look at the existing messages: by the time you get to p. 15 (page numbers are on the bottom of the card and you may have to scroll down) you'll get the picture.
http://www.groupcard.com/c/op-ZpJUDGRj