The evolution of Risk (the board game)
defectiveyeti.com
defectiveyeti.com
I have also noticed the style of game play of me and my friends has become more risk-averse. No body wants to make the first major attack as it's better to sit and wait and beat on a weakened enemy. This leads to everyone sitting and waiting for someone else to make the first move which can make for even long game play!
I'm not sure about the value of a $NZ100 game that needs to be turfed after 15 games, but as one of the comments said, if you amortize that out over 15 games and 5 players, it's pretty cheap entertainment.