Why didnt I bet?

[tighterr]

10-20 full table (pretty loose game)

4 to the flop Hero is BB with KQo

Flop is Q [img]/images/graemlins/diamond.gif[/img]10 [img]/images/graemlins/club.gif[/img]8 [img]/images/graemlins/club.gif[/img]
SB checks, Hero checks, hopeing to c/r?, CO check, Button check.

Turn 7 [img]/images/graemlins/diamond.gif[/img]
SB checks, Hero checks, CO bet, Button call, SBfold, Hero Calls.

River A [img]/images/graemlins/spade.gif[/img]
Hero Checks, CO checks, Button Bets, Hero Folds, CO calls.

The reason I didnt start out betting from the flop is because the board floped so neatly. I knew that anyone with a J or [img]/images/graemlins/club.gif[/img] draw is calling my one bet. I figured if someone bet out in late position I could make it 3 bets to the fishers.
After that didnt work out and the 7 fell on the turn the pot was two small for me to push it anymore and risk the reraise.
Am I way off in my thinking? Would anyone fold the turn bet?