Sadly we're not going to hear from many people who didn't match in their top 3 here. 🙁
Just the self-selection process of SDN.
I don't think we're going to hear from many people
in general. The responses on these match threads have been decreasing every year, but there's usually 2-3 times the number of posts that we have in this thread.
I'm not sure why this is changing. I think it's a combination of factors:
1. SDN is more ubiquitous, and there's increased paranoia about people losing anonymity.
2. Old players in the forum dominate conversations (plus or minus any bullying) and this either intimidates the students, or just makes them less interested in posting.
3. Match day was a Friday, then it was St. Patty's Day, so there's a collective SDN hangover that will carry into next week.
4. People are taking what they need from the site without giving anything back. This, of course, isn't new, as most people posting during the interview season typically appear out of nowhere in November and disappear at this point.
5. As you mentioned, there's a selection bias, so an SDNer's ego may prevent him/her from sharing that they went low on the ROL. Since people are applying to and interviewing at more places these days, the average landing point on the ROL should be trending toward a higher number.