Good point, and that will be up for discussion.. this is currently a throw it out there and lets make it work as a group idea right now.
it can be as simple as credits per link per PR? although I think PR is a bad guage but its somthing to go on..
Say you need so many credits per day of viewing or somthing rather than a flat each week it rotates? With the thought of keeping past content the idea of only having your page for 1 day is actually not bad anymore.