Josh, on some level, you must agree that letting players opt in or out when they show up at the tournament creates a bit of a clusterf@#k. Things that can happen (some of which are already mentioned):
TD does not explicitly give this option ahead of time, player finds out later and demands to be removed because they were not informed. TD refunds dollar and writes in to change results (removing points already earned by other players), or pays the dollar, forcing the would be opt-out player into the results against their will.
Opt out players take the top three spots. 4th place now "wins" the tournament, as far as WPPRS are concerned. Have fun explaining that to everyone at your next event.
Players show up expecting the normal 30 players, but 20 of them opt out. Enjoy 1/3 of the WPPRs you were expecting.
TD normally takes money from winner, opt out player takes 2nd (and prize money as well). Now the opt out player has won the same amount they would have won even if they had opted in. (I realize the accounting doesn't change, but the perception of where the money is coming from becomes cloudy in the eyes of the players).
Announcing the tournament results via email or Facebook. TDs can enjoy either: re-explaining the split every single time and posting two different sets of results/photos, or gloss it over by just omitting the opt outs and then trying going around in circles in the comments when the actual winner (who opted out) starts bragging that they won.
Player tries to opt out and TD says they don't allow it (which is what I plan to do). Player says that the rules of the tournament did not explicitly state that there would be no opt-outs. TD says either "I put that on Facebook", or "I'm not required to publish it". Player says they didn't know, but has now traveled to this tournament. Now what?
As far as WPPRs are concerned, players who opt out are not included in the tournament results. This means that a person can pay $1, be included for WPPRs, and win the tournament without direct competition against any other player who is included in the tournament results. This won't happen all the time, but could easily happen if 20 of 30 opt out. 9 of the $1 players beat up on each other and get eliminated. The 10th coasts to a victory against the 20 opt outs. No direct play occurred between her and the other 9 fighting for WPPRs. In my opinion, this very clearly violates the existing "direct play" component required for WPPRs.
I like the change, and have no problem with the $1 fee. Very curious to see how it turns out. But, I feel very strongly that allowing a mixture of opt-ins and opt-outs in the same tournament is asking for trouble.
What is the benefit of this over requiring an event to choose to be one or the other? I think splitting the tournaments up-front into WPPRs, and no-WPPRs would be straightforward, and healthier...especially for encouraging newer players.