going through the responses, so far I'm pretty impressed with David Nicoson:
Quote: Try this thought experiment. There's 0 in the pot. We're a dog at 49.9% to win the pot. Our opponent bets a billion. We're wrong to call anything here, but we certainly don't lose a billion dollars by making this call.
Alot of people should read that again, it pertains to alot of "loose" calls in poker. (obviously!)