Value against unknown?

[CamelZoo]

Playing on new site no reads 5/10 full - I want to know how everyone maximizes value here without getting out of line.

Three limps to me in LP with T[img]/images/graemlins/spade.gif[/img]T[img]/images/graemlins/club.gif[/img]

SB calls, 2 limpers call after I bump it to $45

Flop (~$200): 2[img]/images/graemlins/spade.gif[/img]7[img]/images/graemlins/heart.gif[/img]9[img]/images/graemlins/club.gif[/img]

checked to me, I make it $175, standard for me, SB calls, limpers fold

Turn (~$550): Q[img]/images/graemlins/club.gif[/img]

check, check

River (~$550): K[img]/images/graemlins/club.gif[/img]

check, ?

how much and with what frequency are you betting out here? let's say with a tag image... turn could have been a whiffed c/r, or he could just be bad, wanting to get cheaply to showdown with an A9-type hand

much appreciated