I assume you're talking about sport - Vidi has actually flat-out said that Multichoice don't have any kind of exclusivity on streaming VOD of series/movies. It's really just the cost barrier that keeps Vidi offering most the content DSTV does.
http://mybroadband.co.za/news/inter...t-blocking-netflix-video-streaming-in-sa.html
Why was TopTV so limited in what they could offer then if it was just a question of cost? They just happened to not show stuff that was also on DSTV?