Starz Entertainment conducted a study amoung nearly 500 Comcast subscribers who were also users of Starz VOD package. Some of the conclusions:

"More than half -- even among those who described themselves as medium to light users of Starz on Demand -- said that they rented and purchased fewer DVDs because of the availability of films on the on-demand platform. Of the roughly 14 million Starz Encore subscribers, about 3.6 million regularly access the Starz on Demand service."