Marginal, but possibly best hand in a small pot

[NIX]

The Button in this hand is not good. He's running at 50/1/.4 over about 100. He'll call down with any pair or flush/straight draw, raising two pair or better. I think he might peel flops lightly with overcards, but everything he has shown down was at least a reasonable hand/draw on the flop or turn if the flop checked around. This doesn't mean that he had odds to call to get as far as he got, but he can fold air.

The SB and MP are relatively unknown as they haven't been at the table long. The SB does seem a little rockish though and has given me a walk once. MP hasn't stood out yet, but he hasn't been taking stabs at pots from LP when it's checked to him.

PokerStars 0.25/0.50 Hold'em (5 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is BB with 8[img]/images/graemlins/spade.gif[/img], 3[img]/images/graemlins/spade.gif[/img]. MP posts a blind of $0.25.
<font color="#666666">1 fold</font>, MP (poster) checks, Button calls, SB completes, Hero checks.

Flop: (4 SB) A[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, Hero checks, MP checks, Button checks.

Turn: (2 BB) 8[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, Hero ???

On one hand, everyone had a chance to bet the flop and declined. I think there is a decent chance that I have the best hand here and basically any card on the river is a scare card for me. On the other hand, the pot is small enough that I don't want to put in more than one bet fighting over something this small. The flip side to this though, is that with the small pot, a bet actually protects my hand from a lot of draws depending on how many people call a bet if I do bet since I don't plan on paying off on a river scare card.

So, is there any value in a bet here, and if so, is it worth betting?