It is a typical ticket lottery, only with numbered raffle tickets instead of slips of paper. They do the same thing at Hugh Jackman's show. I can think of two reasons off the top of my head for this: 1) you don't have to worry about reading someone's illegible handwriting, and 2) all the tickets are uniform, so there are no accusations of intentionally choosing the pieces folded in a specific or interesting way, thus ensuring that it truly is random. You can also buy one roll of hundreds of raffle tickets for about $5, whereas those slips of paper require a whole sheet of printer paper for only 4 slips. Ink and paper add up.
It makes sense to me.
And yes, I'm sure the mailing list sign-up is just a tie-in, not a requirement to enter.
Nothing matters but knowing nothing matters. ~ Wicked
Everything in life is only for now. ~ Avenue Q
There is no future, there is no past. I live this moment as my last. ~ Rent
"He's a tramp, but I love him."