Guys, according to the New York Times, Fezzik's bets range from $500 to $2000. (www.nytimes.com/.../the-super-bowl-of-sports-gambling.html). It's pretty clear from the article that this information came from Steve himself, who was interviewed for the piece.
Based on that, I've always assumed he bets around $1000 per unit, give or take, even though that means he's betting $3000 on a 3-star. Hope this helps.