Topic summary
Free to play

Extracted from the Wikipedia article Free-to-play.
Comparison with traditional model
The free-to-play model has been described as a shift from the traditional model of buy-to-play game, where the game's success is measured through statistics such as player count or units sold. Within free-to-play, the most important factor is the number of players that a game can keep continuously engaged, followed by how many compelling spending opportunities the game offers its players. With free games that include in-game purchases, two particularly important things occur: first, more people will try out the game since there is zero cost to doing so and second, revenue will likely be more than a traditional game since different players can now spend different amounts of money that depend on their engagement with the game and their preferences towards it. Player populations that spend money on free-to-play games can be broken up into terms that borrow from gambling: "whales" which typically are the smallest segment, up to around 10% of players, but are willing to spend the most on a game; "dolphins" which represent a larger portion of around 40% of players who spend some money but not as much as whales; and "minnows", representing about half the population, who spend the barest amount to maintain activity. As a result of this distribution, whales typically provide most of the revenue in free to play games, and in some cases, 50% of the revenue comes from 0.15% of players ("white whales") in one report. It is not unlikely for a very few players to spend tens of thousands of dollars in a game that they enjoy.