Buy Bet Vig Rules: The Hidden Commission Trap in Craps
The buy bet looks like a straight upgrade over the place bet—true odds, fair payout, no house edge baked in. That illusion dies the moment the floor person reminds you about the vig, and the way that commission is calculated decides whether your buy bet is a sharp tool or a slow bleed. 💸 Most players never audit this. They just hand over a dollar and move on. That dollar is the difference between a 1.5% edge and a 4% hemorrhage on every single wager.
Here is the mechanical truth: a buy bet on the 4 or 10 pays true odds of 2:1, but the house charges a 5% commission on the wager. On a $20 buy, that is a flat $1 vig. Run the math and your effective house edge sits at roughly 4.76%—worse than the place bet it supposedly replaces. The buy bet only becomes competitive when the wager climbs high enough that the fixed commission dilutes across a larger base. At $40, the same $1 charges out to about 2.44%. At $100, it drops near 1.19%. The break-even line is brutal and exact, and if you do not know where it sits, you are just donating.
The Commission Timing Rule Nobody Explains
This is where the Buy Bet Vig Rules split into two philosophies, and the casino always wins the ambiguity. North American houses generally collect the commission upfront, on the win. European and Australian dealers frequently take it only after a winning resolution. What sounds like a minor procedural quirk is actually a massive EV swing. Upfront collection means you pay the vig even on losing outcomes, which compounds the cost across a session and drags the effective edge higher than the printed number. Win-only collection is far friendlier, and any player who does not verify the timing before dropping chips is flying blind. Ask the dealer. Watch the tray. Confirm it twice.
Rookie gamblers obsess over the pay table and ignore settlement mechanics. That is backwards. The payout structure is printed on the felt; the commission handling is not. A Craps Commission Guide that skips the timing question is worthless. The button placement—whether the vig gets dropped before or after the dice resolve—is the real variable, and it changes your long-run expectation by several percentage points.
Vig Caps and the Break-Even Sanity Check
Many houses cap the commission at a maximum, often $5 per bet, regardless of wager size. This cap is the only thing that makes large buy bets mathematically sane. If you buy the 4 for $200 and the house charges a flat $5, your effective edge is a manageable 2.38%. Without a cap, the percentage scales linearly and punishes you for sizing up. The disciplined move is to confirm the cap before you commit, because uncapped vig on a large buy is a silent killer that looks like a premium bet and behaves like a charity donation.
Do the arithmetic at the table, not after. Divide your commission by the wager, then compare that fraction against the edge you would pay on the alternative. If the buy bet cannot beat the place bet's 1.52% on the 6 or 8, do not buy—place. If the wager is large and the cap applies, buy aggressively and let true odds do the work. 🎯
Where the House Edge Actually Hides
The brutal reality is that a $20 buy bet on the 4 carries a 4.76% house edge—identical to the place bet on the same number and worse than many players assume. The vig is not a fee; it is the edge. Every commission dollar is a direct transfer of expected value, and the 5% rate compounds against you with each resolution. The buy bet's reputation as the "smart" play only holds above the $40 threshold, and only when the commission is collected on wins exclusively. Below that line, the place bet wins the efficiency contest outright.
Watch for houses that round the vig upward on partial-dollar wagers, or that apply the commission per-decision rather than per-wager. These micro-rules are where the profitability of the entire strategy lives or dies. A dealer who casually says "five percent" is telling you nothing useful until you pin down the collection moment, the cap, and the rounding convention. Lock all three down before the first come-out roll. 🎲
One final mechanical detail: when the vig is collected upfront and your bet stays up through multiple resolutions, some houses charge per roll while others charge per wager placed. Per-roll commission on a long-lived buy bet is catastrophic—it can multiply your effective edge beyond any place bet alternative. Confirm the unit of collection. That single question determines whether the buy bet is your weapon or your wound.