Hacked or no, Absolute is the repository for donks

[Passaman]

Present company excluded, of course.
So, I'm sitting on my patio, drinking coffee, and I decide to play a sit-n-go to pass the time. I register quickly in one about to close, failing to notice that it's a poo-flinging SNG. I go on to win, ldo. In case you're wondering, and I know you're not, the worst players online can be found at $6 limit SNGs imo (present company excluded, again, ldo). Here's the hand that basically sealed the win for me. I'd love to hear any argument, pot odds, my bluff, play the board, etc. to explain uber-donk's call on the river. (for some reason, no site likes to convert from Absolute)

I'm Normndrabble, ldo

Stage #931998724 Tourney ID 1863537 Holdem Single Tournament Normal $300/$600 - 2007-10-05 11:28:50 (ET)
Table: 16773723 (Real Money) Seat #8 is the dealer
Seat 5 - VANELANE ($2550 in chips)
Seat 6 - TAJMAHAL1110 ($5270 in chips)
Seat 8 - NORMNDRABBLE ($5680 in chips)
VANELANE - Posts small blind $150
TAJMAHAL1110 - Posts big blind $300
*** POCKET CARDS ***
Dealt to NORMNDRABBLE [9c 7c]
NORMNDRABBLE - Raises $600 to $600
VANELANE - Folds
TAJMAHAL1110 - Calls $300
*** FLOP *** [4c Qc 6c]
TAJMAHAL1110 - Bets $300
NORMNDRABBLE - Raises $600 to $600
TAJMAHAL1110 - Calls $300
*** TURN *** [4c Qc 6c] [10c]
TAJMAHAL1110 - Checks
NORMNDRABBLE - Checks
*** RIVER *** [4c Qc 6c 10c] [8c]
TAJMAHAL1110 - Checks
NORMNDRABBLE - Bets $600
TAJMAHAL1110 - Calls $600
*** SHOW DOWN ***
NORMNDRABBLE - Shows [9c 7c] (Straight flush, ten)
TAJMAHAL1110 - Mucks
NORMNDRABBLE Collects $3750 from main pot
*** SUMMARY ***
Total Pot($3750)
Board [4c Qc 6c 10c 8c]
Seat 5: VANELANE (small blind) Folded on the POCKET CARDS
Seat 6: TAJMAHAL1110 (big blind) HI: [Mucked] [6h Qs]
Seat 8: NORMNDRABBLE (dealer) won Total ($3750) HI$3750) with Straight flush, ten [9c 7c - B:10c,P:9c,B:8c,P:7c,B:6c]