Storage is cheap. Edge connections are not. It makes sense to have 120 instantiations of the videos if that huge multitude is necessary to optimally serve the p

Storage is cheap. Edge connections are not. It makes sense to have 120 instantiations of the videos if that huge multitude is necessary to optimally serve the plethora of mobile devices out there: you don't want to be negotiating for the worst bitrate out of a 720p encode if the device you're delivering too is only capable of 480x320 and can only gain access to 3G networks.