The idea is novel, but it's a solution to a trivial problem. Most companies probably don't pay any significant amount of thought to sports standings. Fewer still would take the time out of their day to contend with some sort of system to keep track everything, much less pay for such a system. It seems like a complex solution to a negligible issue. EDIT: More so than the price, the work involved in implementing a syst…
In my group that would use it (a college fraternity), we'd definitely be up for putting in the effort for this (lots of utility derived from trash talking, etc). I cannot imagine, however, that we'd pay $15/month for it.
A related website http://athleague.com/ (runs our school's IM sports) has options to purchase team paraphernalia or related things through their websites. As a college student, I can't say I know much about how that would be monetized in an office setting.