I, too, was not successful. I have the Gold Family membership, but I had noticed in the fine print that it was for yourself and 1 guest. As I wanted to bring along 2 family members, I signed up for the free 30-day trial of the TCM Backlot. I had both windows open and continually refreshed them. The TCM Backlot got me in at 1p ET, but I didn't submit my info right away as I wanted to make sure I could get in with D23, which didn't have the ticket button available until 1:02p ET (and was completely sold out, of course). By the time I went back to TCM Backlot, I got an error message, so I lost out.
I have been a member of D23 since the start and have been continually disappointed with the damaged magazines I receive in the mail (corners are always bent). I miss the days the magazines were sold in bookstores. One year after I had called a second time to complain about a damaged magazine I had received, I was told that I could only receive one replacement magazine a year. For what everyone pays, you would think they would have a better way to package their magazines.
Anyway, the only D23 event we have been able to attend in our family's price range was the POTC event earlier this year at Disney Springs with Marty - so immensely thankful we had the opportunity to hear him speak. Aside from that, I'm not sure about continuing the membership. If the magazines were offered in stores again, then I would cancel the membership.
I wish they would offer additional opportunities, so more people could take part, but c'est la vie. I know I'm very fortunate to have been on the ride as many times as I have - will truly miss it.