nearly all the players ranked #8 to #20 have entered here. It's very risky because most of them will end with QF or less, having to play very difficult matches in the process. It's a "all or nothing" thing.
Probably because at this stage of the season, and for this group of players, it's about making the WTF or nothing. A few of them will have a chance at that with a win here over their closest combatants. Sure, finishing top10 is nice too but it doesn't matter much in comparison I reckon.