It's happened to me, I had been posting in these since the original line by Lin. (If you're curious, CoveTom
started it soon after the death of Ricardo Montalban on a line by line of The Wrath of Khan as a tribute) then we went through all the rest of the films, after that the random.org method began. I didn't get chosen for a long time after that. So it was about 2 years for me from the first time I posted in one of these til when I got to choose the episode. And then I was on a roll! I my number came up 3 out of the next 5!