I know that my DW Sue is member #40,000.
I was watching the boards the day that the number of members was coming up on 40,000. As soon as the 39,999th member registered, I registered my wife. I have a screen capture somewhere that welcomes "FlowerLady" as the 40,000th DISer.
She posted one time and that was the end of that.
So I know who #40,000 is, but beyond that, I'm clueless.