just wanted to share my experience:
me and my family of 5 headed up to the RRT on tuesday night and got there around 8:45pm. we were aiming for either of the wednesday shows. we didn't have a preference, we just wanted to get in. we got there and we were 5th in line, about 8th for tickets. we camped out overnight and got a room at a hotel nearby, so one or two of us could go up at a time and rest and swap throughout the day. i dont know if this counts as line swapping, but the people around us in line were okay with it since there were at most only 2 out of 5 of us in the hotel room at a time. we knew we were going to get into one of the shows, it was just a matter of which one. we ended up being the last group of people in for the matinee; we had two pairs (row g and h) and one standing room ticket.
if im not mistaken, there was a total of 14 tickets given out for the wednesday matinee: 1 pair of premiums earlier in the day, 3 singles, 4 pairs, and 1 SRO. we honestly couldnt believe our luck! we got to ny, waited in line, and saw the show in less than 24 hours. it's truly an amazing masterpiece, and i hope you all get to see it soon. :)