Betting so you don't have to show down your hand

[Captain R]

Anyone do this? I guess it's a question of how much "not showing your hand" is worth.

You have 7[img]/images/graemlins/heart.gif[/img]2[img]/images/graemlins/diamond.gif[/img] in BB.

1 limper fish, SB calls, you check.

Flop is Q[img]/images/graemlins/club.gif[/img]5[img]/images/graemlins/diamond.gif[/img]5[img]/images/graemlins/spade.gif[/img].

SB checks, you bet, fishy calls with any 2 cards that are pretty, SB folds.

Turn is J[img]/images/graemlins/club.gif[/img]. You bet, fish calls with any pair or any draw.

River is 2[img]/images/graemlins/heart.gif[/img]. You would normally check this and hope fish is on a draw, but you bet it because you don't want people to see what you're trying to steal with and you want to maintain your solid image so you can continue to steal more pots in the future.

Good bet or idiotic?