All-in Call with Baby Set?

[Intrepid]

This hand occurred in a live $100 buy-in game with $1-$2 blinds. Five players saw the flop come: 2 [img]/images/graemlins/diamond.gif[/img]3 [img]/images/graemlins/diamond.gif[/img]4 [img]/images/graemlins/diamond.gif[/img]. I had about $110 left and was holding 33 on the button. A loose-aggressive bet $40 all-in, a conservative player raised to $130 all-in, an average/conservative player with about $120 called all-in, and my fourth opponent folded. How much money would have to be in the pot before the flop to justify calling all-in with my baby set?