"So far, premium movie sites have not created a thriving industry the way iTunes has for the digital music market. It's not clear whether the sites' business models need tweaking, or whether awareness is still too low for greater success. Online movie sites run into some factors that didn't affect digital music providers. For one, movie file sizes are much bigger, requiring more time for downloading. Additionally, services like NetFlix combine the convenience of the Web with the ability to watch movies on a TV instead of a computer."
