Gaming concept for convention game - input sought?

[FifteensAway]

Here is the link to the specific page of my general gaming blog:

http://steeplechasingzebras.blogspot.com/p/the-wild-west.html

Go down to the December 4, 2012 entry (at bottom of page) and read up and give me your ideas on how workable you think this might be - if you are so inclined.  Appreciate any comments.  Thanks.