Players buy Robux using real money to spend in games and on avatar items.
Roblox (the company) earns money directly from Robux sales and Premium subscriptions.
Game developers earn Robux when:
Players buy special items or upgrades in their games.
Players rent private servers for exclusive game sessions.
Players spend time in their games
Developers can convert Robux into real money through the Developer Exchange
Robux is the universal currency across all Roblox games.
Many games also have their own in-game currencies (gold, gems, or cash).
Players spend Robux on:
Avatar accessories (hats, clothes, gear).
One-time game passes (access to special tools or zones).
Repeatable purchases (in-game currency, boosts, pets).
Some games include trading systems, letting players exchange rare or limited items.
Real Money → Robux → In-Game Purchases → Developer Earnings → Real Money
Sometimes players practice deferred consumption(saving up) and sometimes impulse buying(splurging).
Developers look at:
What items players like most.
How much time people spend in their games.
What prices encourage players to buy.
Some items increase in value over time due to player demand and scarcity.