This hand amuses me.... value bet river?

[kurto]

This hand made me laugh (because I'll give it away now, I won it)... and I missed my chance to see what anyone else had.

I'm at a passive table (as you'll see) There's 3 or 4 limpers or so before me so (I'm 2nd from the button), I'm pretty sure it won't be raised, so I limp with 6-7suited. Button and blinds all call.

FLOP - 6-7-Q. (no flush draw)

An early player makes a weak bet (1/2 pot) bet, 2 callers, I overbet (a little more then the pot). Button calls, and original better calls and one other.

TURN - Q-6-7-Q

Okay. I figure I'm done with this. EP players check to me. One of them has to have a queen and there's still the button to play, perhaps they're worried about kickers... so I check. The button checks. ???

RIVER 10 Q 6 7 Q

Checks to me. I'm still thinking someone's gotta be sitting on something AND a flopped OESD just got there. I check. Button checks. I win and everyone mucks.

What the hell did these people have and is there any argument that I should have been betting anywhere?

I was multitabling so I didn't check the hand history... but it stuck in my craw because I couldn't put any of them on a hand that called my overbet.