A9s in SB

[MadMojoMonkey]

Bovada No-Limit Hold'em, $0.05 BB (9 handed) - Converted by MadMojoMonkey's patient ass

MP2 ($5.00)
HJ ($2.29)
CO ($6.90)
BTN ($4.88)
SB (HERO) ($7.19)
BB ($2.95)
UTG ($6.19)
UTG+1 ($3.03)
MP1 ($2.37)

MP2 posts dead $0.05

Preflop (0.12): Hero is SB with
1 fold, UTG+1 limps, MP1 limps, MP2 checks, HJ limps, 1 fold, BTN limps, Hero limps, BB raises to $0.20, UTG+1 folds, 5 calls

Flop: ($1.25) (6 players)
Hero checks, BB bets $0.20, MP1 calls $0.20, MP2 raises to $0.50, 2 folds, Hero folds, BB calls, MP1 calls

Clearly this is a juicy table full of tasteee fishies. I just wonder if I played this well. This situation (or something quite similar) came up 3 times in as many orbits.

Am I donking away monies by calling pre-flop? Would you fold to the limpers or the raise from BB? If you DO see the flop, would you play anything other than fit-or-fold in this spot?