PokerStars lost 12 percent of their Sunday Million crowd and Full Tilt Poker failed to meet their guarantee in the first weekend following NETeller's U.S. withdrawal.
January was shaping into the largest month in online tournament-history for both PokerStars and Full Tilt Poker until American players lost most of their depositing options last week.
Citadel, INSTAdebit and several other e-wallets left the U.S. after NETeller co-founders Stephen Lawrence and John LeFebvre were arrested and charged with money laundering.
The 6,742 who participated in last weekend's the Sunday Million helped PokerStars easily pass their guarantee, but the numbers were the Web site's lowest figures since early December.
It was the first time PokerStars experienced a non-holiday decline in players since the Unlawful Internet Gambling Enforcement Act became law.
Since President Bush signed the UIGEA into law, PokerStars has seen a 24 percent increase in Sunday Million players.
Before the arrests, PokerStars drew two consecutive record-breaking crowds on Jan. 14 and Jan. 7 of 7,632 players and 7,129 players.
Despite competing with the NFL playoffs, PokerStars generated nearly $3 million for the two weekends and the Jan. 14 PokerStars Sunday Million was the largest non-special event tournament in online history.
The e-wallet exodus from the U.S. also hit Full Tilt Poker hard. The online poker room was hosting its first $750,000 monthly tournament and posted a $60,000 overlay.
The non-holiday overlay was Full Tilt's first since the World Series of Poker last summer.
Full Tilt has been one of the primary beneficiaries of Party Poker's exit from the U.S. increasing Sunday guaranteed numbers by 119 %.