How would this be useful to them? I don't think they care if their instances are on the same box or not. Also, how is what Heroku and PHP Fog arbitrage? They

How would this be useful to them? I don't think they care if their instances are on the same box or not. Also, how is what Heroku and PHP Fog arbitrage? They're just providing a service on top of another service; they don't even work with multiple markets.