How much revenue did Garry's Mod make?

An estimated 178.2M to 479.1M net after Steam's roughly 30% cut, derived from the copies estimate and its price.

How many copies did Garry's Mod sell?

Q: How many copies did Garry's Mod sell?

An estimated 64.9M to 105.4M copies, based on its 1.2M Steam reviews. This is a labeled estimate from the review count, not exact sales.

Estimated copies sold: ≈ 64.9M–105.4M; $178.2M–$479.1M net $324.0M–$737.1M gross; from 1.2M reviews (Overwhelmingly Positive)

A labeled estimate from the public review count (adjusted for release year), not exact sales. Owner data cross-checked with SteamSpy.

Does this actually work?

We left Garry's Mod out and predicted the genre from its 8 similar games. Every figure here, including Garry's Mod's, is estimated from Steam reviews, not self-reported sales.

Copies, estimated from reviews

typical (middle half) 22.1M–77.9M

best case 662.3M (Counter-Strike 2)

The Multiplayer lane

A big, proven genre, though hit-driven: most sell around 63.4M copies, while a few break out far above.

A typical game

≈ 63.4M copies

≈ $300.3M after Steam's cut

from ~928k reviews

Best case

≈ 662.3M copies

Counter-Strike 2

from 9.7M reviews

A breakout hit, far above a typical game.

7 of your 8 games sit in the typical range; 1 is a breakout hit far above it.

Copies and revenue are rough lifetime estimates from the review count; typical figures are medians per column, so they can come from different games.

The lane you'd be entering

Winners here lead with FPS + Shooter, priced around $25.
The breakout hits carry Competitive + e-sports + Tactical; a typical game here doesn't.
The games you compared span 2007 to 2016, a lane with a long track record.
A typical game here lands in Diamond ($1M+ before Steam's cut, est.). Tiers: Chris Zukowski's benchmark tiers.

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Counter-Strike 2 2012	Est. copies ≈ 504.6M–820.0M 10x vs typical SteamSpy 100M–200M	Est. revenue Free	Free	9.7M reviews Very Positive	FPSShooter +6
Euro Truck Simulator 2 2012	Est. copies ≈ 48.3M–78.4M SteamSpy 10M–20M	Est. revenue $265.4M–$713.5M net $482.5M–$1097.6M gross	$19.99	928k reviews Overwhelmingly Positive	DrivingTransportation +6
Team Fortress 2 2007	Est. copies ≈ 64.5M–104.8M SteamSpy 50M–100M	Est. revenue Free	Free	1.2M reviews Very Positive	Free to PlayHero Shooter +6