A free room. A buffet voucher. A limo to the airport. Casino comps look like generosity. They're a refund — typically about 30% of your theoretical loss to the house. The other 70% is the casino's expected profit on your visit.
This article explains exactly how comps are computed, what they're worth in real terms, and why chasing them is almost always a money-losing decision.
What casinos actually track
Your player card records:
- Average bet size
- Hands per hour (estimated by the dealer or pit boss)
- Hours of play
- Game type
From these, the casino computes 'theoretical loss' (theo): theo = average bet × hands per hour × hours × house edge.
$25 average bet × 80 hands/hour × 4 hours × 0.5% blackjack edge = $40 theo. The casino expects to take $40 from you, on average, for that 4-hour session.
The comp rate
Casinos comp roughly 30% of theo. Industry-typical rates by game:
- Slots: 30-40% comp rate (slot players are the casino's most profitable customers, and the easiest to track)
- Table games (BJ, baccarat, craps, roulette): 25-35%
- Video poker: 15-25% (because edge is so low, comp dollars are small)
- High-limit pit: 30-40%, sometimes 50% for sustained action
On the $40 theo example: $12 comp value. About a buffet entry. Not a free room.
What comps are actually worth to you
Comps come in two flavors:
- Cash equivalents — free play, room comps, food vouchers, free shows. These have face value to you that's close to their stated price.
- Discounts — 'two-for-one' steakhouse offers, room upgrades, line-skip privileges. These are worth less than face value because you might not have used them otherwise.
A 'free' $300 room at a casino that costs $90 to operate is comping the casino $90, not $300. To you the room is worth somewhere in between — depends on whether you'd have paid $300 for it elsewhere or stayed in a $120 motel.
Why chasing comps is a losing strategy
Some recreational players play longer specifically to earn more comps. The math:
An extra hour of $25 BJ play at 0.5% edge = $10 expected loss to earn ~$3 in comp value. Net: -$7 per extra hour played.
You're paying $7 to get $3 back. That's not 'earning comps' — that's losing money slightly more slowly. The comps look like winning because you don't see the implicit loss they represent.
Exception: if you'd be playing anyway, comps are pure upside. The mistake is letting comps drive marginal play hours.
How to maximize comp ROI
- Always use the player card. Untracked play earns nothing.
- Build a relationship with a host at properties you visit regularly. Hosts have discretion to bump comp tiers and resolve disputes.
- Aim for the upper end of player tiers — they often have disproportionate jumps in comp generosity.
- Use mailers, not requests. Casinos send custom comp offers to players based on tracked theo. Wait for them rather than asking for comps blind.
- Consolidate play within a property group rather than spreading across casinos. Tier credits compound.
Why card counters get terrible comps
Counters track to near-zero or negative theo because they're not actually losing money on average. Casinos comp based on theo, so counters earn almost nothing — the casino's database thinks the counter is breaking even and doesn't owe a refund.
Some advantage players deliberately bet flat through some sessions to inflate their tracked theo, then earn comps that subsidize their actual edge. This is called 'comp hustling' and it works at properties that are slow to detect counters.
Bottom line
Comps are not free money. They're a return on your expected loss to the casino, typically 30% — sometimes higher for slots and high-limit play, sometimes lower for VP. Use comps to subsidize play you'd do anyway. Don't play extra hours to earn them — that math doesn't work.
Use the /calc/comp-rate calculator to see exactly what your trip is worth in comps so you can plan around it instead of chasing it.