A gaming system where, as players place wagers to play the primary games of the gaming devices, a portion or percentage of the wager placed by each player to initiate the primary game is allocated to an accumulated value pool. A target value is based on the average expected payout of a bonus event. In...http://www.google.co.uk/patents/US20080102920?utm_source=gb-gplus-sharePatent US20080102920 - GAMING SYSTEM AND METHOD OF OPERATING A GAMING SYSTEM HAVING A BONUS PARTICIPATION BIDDING SEQUENCE
