Pre-flop hand odds question

[nick604]

Apologies if I've put this in the wrong forum, but wasn't quite sure where it belonged.

Can anyone tell me what the minimum pot odds have to be in limit hold'em to justify playing ANY 2 cards?

eg at my (hypothetically very loose) 10-handed table, if I'm in the SB with 72o, everyone has called the big bet, and I think it's unlikely the BB is going to put in a raise, surely I'd be justified in calling the big bet when I'm being offered 19-1 odds?

Perhaps I'm missing a vital point here, or have come over extremely fishy, but would appreciate hearing any advice on this...