Just a question, I know there are dozens of iptv sellers and resellers but I believe they pretty much use other people to supply them the content. Does anyone know who genuinely controls these or details of iptvs who only stream from their own sources...I am confused but hoping to be enlightened!
I think it varies. There are definately some wholesalers out there that providers use, but there are other methods providers can use to obtain streams as well.
One main method that is done, is re-streaming from legit "online streams". Example of this could be the psvue, where people pay for a selection of streams, and then restream using tools such as ffmpeg. This allows providers to technically, grab from official sources.
Some streams, or special events can come this way too from sites like nhl.com, hbogo, fsgo, stuff like that.
Another method of obtaining streams that seems to be getting popular on some forums is trading. For instance, if you have 2 receivers at your house you could stream those 2 channels for a few other channels in return. In some cases, you could even stream a channel and a provider may even give you credits in return, effectively making you money (even if indirectly).
Lots of ways to get channels, and lots of smart guys over at /r/StreamTalk as well!