We have been over this... Vegas has Pats favored by 5 at -110. So you'd have to bet $110 to win $100 (plus your original $110 wager back). I'll give you the same bet at +200. So, if you bet $100 and they cover at -5, you win $200 (plus your original $100 wager back). Ties push, so a win of exactly 5 means no one gets anything.