About $300/mo on an app that provides real-time train tracking for Boston's commuter rail. Thankfully for me the MBTA is a mess, so each system meltdown (which

About $300/mo on an app that provides real-time train tracking for Boston's commuter rail. Thankfully for me the MBTA is a mess, so each system meltdown (which happens about once a week) causes a spike in downloads.