My vote will be no surprise, I'm L2 and am interested in tournaments.
However, I also think L1 players should be able to join. But in order to make sure people join the games, some rules could be set by the tournament host. For example:
* This is a tournament, make sure you try to be available in case you advance to next rounds. (To prevent L1 players to join a game while waiting for the next round)
* Round 1 invites will be sent on the first day of the month through PM. Be sure to check the forums or enable e-mail notifications in order to receive the invite URL.
* You've got 48h (or 36h) to join, after that a reserve player will be sent an invite. (Or if there is no risk of reaching 10 players: two reserve players are sent an invite, the first to join gets the spot.)
* That reserve player has 24h to join, after that the game is started.
TopKilla pretty much did this, I just think the timeframes could be a bit shorter to reduce waiting. Also, when round 1 was over, round 2 was started a bit early. So while it felt like a very long wait, some players joined quickly after Dec 1st, which was when the 2nd round was set to start.
Most forum members with several posts will be serious about this. Part of the players who sign up to the forums in order to join, will be as well. But we just have no way of predicting that.