The minimum buy-in in limit is $.20, so you could always go there and take a shot at it. It's not likely to work, but it's only $.40. And then you can use the FPP's to try to get a
bankroll if/when that doesn't pan out.
The 70 FPP to the Sunday $100k are 10 player, winner-take-all games. If you unregister from the Sunday $100k you get $11T. You can use those $T to play S&G's and stuff to win
real money that you can play with in ring games.
Personally, I'd rather play the 210 FPP to the Sunday $100k. It has 20 players, but pays the top 6 places. In my opinion, the 210 FPP one would be more than 3x easier to win.
At the 70 FPP winner-take-all game, one good player at the table can spoil it for you. Plus, blinds/antes at the end can make it a crap shoot. Beating the other 90% of the field can be rough.
But with 6 people getting paid, you only have to beat 70% of the field. And people play too aggressive at the end of these things. Often they get to a point where they can fold their way to victory, but then shove with their A/To against someone who opens from early position. All the dumb play a the end, (people not understanding that they're playing for top 6, not #1) is a big advantage.