If you become super interested, and do major ass kissing you might get dunked in 3 months, heard of those before but who would want to go through the ordeal of major ass kissing.
Like someone said, what's the point? So you'll get a video of boring meetings, of dubs saying how close the end is, how they look forward to living in a peaceful new earth..... So what exactly will that accomplish? Chances of you stumbling upon a pedophile, are very small. Uncovering some sort of fraud that wts does like how they charge dubs for assemblies or parking that's included in their DC contracts? Won't happen unless you're extremly lucky, again chances of any juicy info caught on tape is like winning a lottery. You're not going to get to an elderhood for a good 3 years if you're super ass kisser and I'm talking about minimum times I've heard of people moving up. WTS isn't a cult where you can get some material advantage, or in fact any advantage to yourself of your family so why bother with a group of boring people while forcing yourself to preach lies to others just to get dunked for a prank?
A lot of congregations have good people that are deluded and under mind control. There is no occult practices, there is no wierd enough stuff going on that would make most people interested in a documentary. Most witnesses are boring, have no lives and live with a hope this world will end soon so they can start enjoying real life - all this while they grow older and their life passes them by.