River value bet? (new to 2/4: MOBS?)

Just moved up to 2/4. 1st table was totally insane. Lots of coming over the top of raises etc. This was about 10 hands into my 2nd session, and at this point I hadn't noticed anything good or bad about the players involved.

Party Poker 2/4 Hold'em (10 handed) converter

Preflop: Hero is UTG+1 with Q[img]/images/graemlins/club.gif[/img], Q[img]/images/graemlins/heart.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises</font>, <font color="#666666">5 folds</font>, Button calls, SB calls, BB calls.

Flop: (8 SB) 7[img]/images/graemlins/club.gif[/img], 4[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#CC3333">SB bets</font>, BB calls, <font color="#CC3333">Hero raises</font>, Button calls, SB calls, BB calls.

Turn: (8 BB) 8[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, BB checks, <font color="#CC3333">Hero bets</font>, Button folds, SB calls, BB folds.

I'm in trouble to a 6, but there's no evidence of one. Cash, grass or ass: no one draws for free.

River: (10 BB) 9[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, Hero checks.

Final Pot: 10 BB

The 9[img]/images/graemlins/club.gif[/img] adds a heck of a lot of coordination to the board, and I check behind on the end. The only hand that pays me off is one held by a moron. Without reads, do we assume moron status and bet? Being c/r on the river makes me throw up in my mouth a little.