Share 'Serious Games cost/price models'

There has been an interesting - an at times slightly heated - debate on the serious game listserv which the folks at Digital Mill administer (subscribe at www.seriousgames.org) about the pricing models for 'serious games' that was initiated by Patrick Dunn (a member of this site). I have posted Patrick's original question below in order to mirror the debate on this site which I think is far mor...