live 6/12 - I need a suited connectors check up

[mrcunningham]

I would like to verify that variance and not stupidity was why I dumped 22 BB in 60 minutes yesterday.

9-handed, typical mostly loose-passive but a couple LAGs on a weekday morning.

5 limpers, and I limp with 5d3d on the button, SB completes, BB raises, we all call.
Flop: Jd 9d 6x
BB bets, 3 call, MP raises, call, I call, SB calls, BB 3-bets, 2 call, MP caps, we all call.
Turn: 3x
MP bets, fold, I call, 2 more callers

Thoughts?
PF: Generally, I will call any suited 0 or 1 gappers on the button in an unraised pot with >3 limpers. Is this too loose? If so, how about in this hand with 5 limpers in front of me?
Flop: I was tempted to 3-bet, but ended up deciding that I wasn't going to protect my hand with a 3-bet in this huge pot, there was no value given the number of callers and my tiny flush draw, and it might get capped anyway without me betting. Was this sensible or does anyone find a 3-bet to be EV+ here?
After it caps, I'm stuck calling because of the huge pot, right?
Turn: Huge pot, I'm along for the ride even if this capped, correct?