Out of the 95 players in this year's $50,000 H.O.R.S.E. event, 41 of them are sponsored by or affiliated with an online poker site. That's about 43% of the field.
Full Tilt Poker - 30
PokerStars - 6
Doyle's Room - 2
Bodog - 1
Ultimate Bet - 1
Gioco Digitale - 1