Am I ahead often enough to justify this call?

[KCrow]

Villain is unknown, no stats no reads.

A river CR is never good, am I ahead here often enough to make calling this profitable.

Full Tilt Poker, $0.25/$0.50 NL Hold'em Cash Game, 6 Players
LeggoPoker.com - Hand History Converter

MP: $50
CO: $51.55
Hero (BTN): $50.80
SB: $55.75
BB: $19.25
UTG: $49.50

Pre-Flop: 7[img]/images/graemlins/heart.gif[/img] 6[img]/images/graemlins/heart.gif[/img] dealt to Hero (BTN)
UTG folds, <font color="red">MP raises to $1.75</font>, CO folds, Hero calls $1.75, SB calls $1.50, BB folds

Flop: ($5.75) 8[img]/images/graemlins/club.gif[/img] 2[img]/images/graemlins/club.gif[/img] A[img]/images/graemlins/diamond.gif[/img] (3 Players)
SB checks, MP checks, Hero checks

Turn: ($5.75) 7[img]/images/graemlins/spade.gif[/img] (3 Players)
SB checks, MP checks, <font color="red">Hero bets $4</font>, SB folds, MP calls $4

River: ($13.75) 6[img]/images/graemlins/diamond.gif[/img] (2 Players)
MP checks, <font color="red">Hero bets $7</font>, <font color="red">MP raises to $14</font>, Hero............