What is it with Flush Draws ?

I just can't seem to get away from flush drawers, I mean, how much do you have to raise to shake 'em off ?

PokerStars Game #8964256346: Tournament #44847005, $10+$1 Hold'em No Limit - Level II (15/30) - 2007/03/18 - 12:35:08 (ET)
Table '44847005 11' 9-max Seat #5 is the button
Seat 1: harley745 (5060 in chips)
Seat 2: sternace (7240 in chips)
Seat 3: HAWK012261 (5025 in chips)
Seat 4: holker (4225 in chips)
Seat 5: Prophet 22 (3775 in chips)
Seat 6: Nater311 (7570 in chips)
Seat 7: canukatm (7795 in chips)
Seat 8: Agriates (5120 in chips)
Seat 9: broncorubin (10950 in chips)
Nater311: posts small blind 15
canukatm: posts big blind 30
*** HOLE CARDS ***
Dealt to holker [Qd Ad]
Agriates: folds
broncorubin: folds
harley745: calls 30
sternace: calls 30
HAWK012261: calls 30
holker: raises 90 to 120
Prophet 22: folds
Nater311: folds
canukatm: calls 90
harley745: folds
sternace: folds
HAWK012261: calls 90
*** FLOP *** [2h Qc 3h]
canukatm: checks
HAWK012261: bets 120
holker: raises 240 to 360
canukatm: folds
HAWK012261: calls 240
*** TURN *** [2h Qc 3h] [7c]
HAWK012261: bets 150
holker: raises 1380 to 1530
HAWK012261: calls 1380
*** RIVER *** [2h Qc 3h 7c] [9h]
HAWK012261: bets 180
holker: calls 180
*** SHOW DOWN ***
HAWK012261: shows [Kh Ah] (a flush, Ace high)
holker: mucks hand
HAWK012261 collected 4575 from pot
holker said, "lol"
*** SUMMARY ***
Total pot 4575 Rake 0
Board [2h Qc 3h 7c 9h]
Seat 1: harley745 folded before Flop
Seat 2: sternace folded before Flop
Seat 3: HAWK012261 showed [Kh Ah] and won (4575) with a flush, Ace high
Seat 4: holker mucked [Qd Ad]
Seat 5: Prophet 22 (button) folded before Flop (didn't bet)
Seat 6: Nater311 (small blind) folded before Flop
Seat 7: canukatm (big blind) folded on the Flop
Seat 8: Agriates folded before Flop (didn't bet)Seat 9: broncorubin folded before Flop (didn't bet)