Roblox pays a developer less than 25% of the revenue a player spends on their game.§ Epic’s Unreal Engine, conversely, takes only a 5% royalty on revenues. The total cost of Unity’s engine is likely to be less than 1% of a successful game’s revenue. Roblox does take on additional expenses for its developers, such as costly server fees, customer service, and billing, but in most cases a developer will still have higher profit potential by building a standalone virtual world, rather than one inside an IVWP.
