[Penguinfan]

If he's the big blind and the small stack pushes in pre-flop the big blind is getting slightly better than even money isn't he? And if it's the SB that pushes in then the big stack is getting exactly even money unless you are to the point where an ante is involved, but I can see a case where as it would just be a few more chips for the BB to call and yet anyone else who limped in would fold, this would be needed to give the BB any kind of correct odds to call as any kind of dog, right?

I will agree that reguardless of the odds here the BB can't just give up the pot to a small all-in raise.