After reading through the features of Edit Flow, my Editor and I initially had thought "story budget" related to an actual dollar amount. After reading about the "story budget" feature we were disappointed it was not even though its actual purpose is handy.
On that note we thought we would chime in and ask if this feature is in the works or has ever been brought up before. The reason: we deal with a lot of contributors that we pay on a contract basis. It would be great to assign a dollar amount to stories and track the flow of you budet along with the editorial calendar.
Hope to see it in the future!