Buy Bet Vig Rules: The Brutal Math Behind the Fee
The vig on a buy bet is not a suggestion β it is a fixed 5% commission extracted on every single win, and that number is the only thing standing between you and a mathematically survivable session. I have audited hundreds of tables across Macau, Vegas, and the Philippines, and the pattern never changes: players obsess over point numbers while the house quietly clips them at the payout window. πΈ
What the Buy Bet Actually Costs You
A buy bet lets you wager on any point number β 4, 5, 6, 8, 9, or 10 β at true odds. That sounds generous until the dealer slides the chips back and says "five percent." On a $20 buy bet on the 4, the fee is $1. On a $100 buy bet, it is $5. The ratio is welded to the wager, not to the win. This is the core of buy bet vig rules, and it is where amateurs bleed.
Run the numbers. A $20 buy on the 4 pays $40 in true odds but costs $1 upfront. That $1 on a $20 bet is the same as a 5% commission, but because the fee is only charged on wins at some properties β and always upfront at others β the effective edge swings between 2.44% and 4.76%. The single most important variable is whether the house charges the fee before or after the roll. π―
The Breakage Point Nobody Talks About
Here is the dirty secret the floor managers do not volunteer: the vig on a buy bet is not always rounded in your favor. Rounding down to the nearest dollar is standard at the $20 level, but at $25 or $30, the house rounds up. That single dollar of breakage pushes the effective house edge on a buy 4 or buy 10 from 1.67% to over 2.5%. Over 500 resolved bets, that is a seismic shift in your expected value.
Compare that to a place bet on the same number. A place bet on the 4 pays 9:5, carrying a 6.67% edge. A buy bet, even with the 5% fee charged on every win, drops that to roughly 4.76% at $20. At $25 with rounding, the buy bet loses its advantage entirely. The breakage is the killer.
When the Fee Is Charged Changes Everything
Two regimes exist. Regime A: the dealer collects the vig only after a winning resolution. Regime B: the vig is paid at the moment you place the wager. Regime B is a trap. Paying $1 on a $20 buy before the dice even move means you are financing the house's float. If you lose, you lose the bet plus the fee. If you win, you get true odds minus the fee. The compounded drag is brutal.
Always ask the dealer: "Is the vig collected on the win or on the drop?" This one question separates a 2.44% edge from a 4.76% edge. At a full table running $5,000 in buy action per hour, that difference is $120 of pure leakage per hour. π²
The Only Buy Bets Worth Making
Buy the 4 and the 10. Never buy the 6 or the 8. The math is not close. A place bet on the 6 or 8 pays 7:6 with a 1.52% edge β buying those numbers at 5% vig is financial self-harm. The 4 and 10, with their 2:1 true odds, are the only numbers where the buy bet's vig can be justified, and only when the fee is collected on the win and rounded down.
Run the expected value. Buy 4 for $20, fee on win, rounded down: edge 2.44%. Place 4 for $20: edge 6.67%. The gap is 4.23 percentage points. That is not a rounding error. That is the difference between a session that breathes and one that suffocates.
The Algorithmic Reality of Vig Extraction
Every casino floor runs a silent extraction algorithm. The buy bet vig is one of its cleanest instruments because it is invisible to the eye and brutal to the bankroll. The fee is not a courtesy β it is a tax on your access to true odds. The only defense is precision: know the rounding rule, know the collection timing, and never buy a 6 or 8.
At $50 buy bets on the 4, with vig on win and rounded down, the house edge is 1.96%. At $100, it drops to 1.96% as well β the percentage is flat, but the absolute dollars extracted scale linearly. A player running $200 per decision on buy 4 and buy 10 is handing the house $9.80 per hour in pure vig at a 40-decision pace. That is the number.