I have thought of joining one of these, but for me the whole dead-is-dead thing is an emotional process. I actually get upset sometimes if my character dies, and it's a
fair death. I can't really conceptualize the idea of putting my character into a contest just to see how long he or she lasts. I'm not criticizing the idea, I'm just saying I have considered it in the past, but don't really understand the contest part of it all.
I still remember the days back when we all table-gamed, back when I was in high school. Simon, my sword-swinging high elf, who was pretty high in level, decided to go back to his homeland. This meant travelling alone, without the rest of the party. It shouldn't have been a problem.
Well, we had to roll dice for every day of travel, to see if any encounters happened. And he got attacked by three dire wolves one night. They surprised him, which means they got the initiative during the attack. Their attacks would go first, and Simon's attack wouldn't happen until theirs were all done. No problem. I mean... it was three measly wolves, right?

Wrong. One wolf's attack rolled double-damage. This means three six-sided dice get rolled, and to get double-damage is pretty rare. Still no problem though, I mean, we're talking about a character who had been around for a few years (Earth time) so he was pretty well-developed for combat. But then the next wolf rolled TRIPLE damage. Three ones, basically. And the next wolf rolled either double or another triple. That's one of those things which
never happens! It was intense.
Except it did happen. Simon the elf was dead.

My other gamer friends witnessed this. I was pretty upset about it. Might've even cried! And that's what it's like for me. Not that I sit there bawling nowadays, but it's also not something i take lightly.
Anyway, good luck your DiD contest. How exactly do these competitions work? I am curious. I guess I could just follow that link...