I disagree--it is a pretty big skill to get someone to do something against his or her own self interest, and in this case I don't think that Parvati did it on her own. She got lots and lots of help from the other women at strategic points in the game.
In the Final Five Episode, every OTHER member in the Final Four PROVED their game over Parv:

• AMANDA, for working Erik over like Sam Waterston in Tribal Council, getting him to CONFESS the BULLSHIT of his game.
• CIRIE, for not only organizing the OZZY boot, (with which Parv only RELUCTANTLY agreed) but for concocting the plan for Erik to give up the HII.
• NATALIE, for not only playing DOG-BOY, Jason, LIKE A FIDDLE, but after DOING SO, got Erik to make an even WORSE play, through her Snaky Powers of Persuasion.

EACH of them proved themselves better Winners than Parv, and her, "Tee Hee! I'm so EVIL! *snicker* strategy to a million dollars.