They publish the ALV and the bid window. They can run a solution that has buffers at the high and low end as long as they don't exceed the window. They can limit the number of 'Min credit' and 'Max credit' bids. I'm assuming they can tweak the number of RLLs. And they can adjust the open time constraints as long as they don't exceed PWA limits.

Lots of things to get the "cost" of a run down. Run/evaluate/run/evaluate/run/evaluate/send to ALPA for review/PUBLISH.