There's no requirement. The tourney registration opens for the top 3500 players of raked hands (I know that doesn't sound right
) but you get it right?
After a certain time, reg. is open to top 5000, then I don't know what. So, in summary, just play more than everyone else.
I was just out of the top 3500 in the last one and got in easily. I cleared the reload bonus and was 3-4 tabling at the $2/$4 tables 2-3 hours a day.