Some 30 of these professionals travelled to Paris this week for this year's four-day League of Legends championships in an indoor multi-purpose arena attended by thousands of fans of the popular online battle arena game.
Sitting next to each other facing an audience of rapturous fans, team players wearing headsets and eyes riveted on computers battled it out in a game broadcast on a giant screen overhead.
"The life of a professional player is fairly similar to that of a high-level athlete," said Kurtis Lau, a retired online gaming star from Hong Kong better known under the pseudonym "Toyz" in the League of Legends world.
"You have to train several hours a day and travel across the world to compete in matches."
League of Legends pits champions against each other in a fantasy world and has become hugely popular with over 67 million people playing it every month, according to the game's developers Riot Games.
The 2014 championships that kicked off on Thursday in Paris featured teams from North America, Europe, South East Asia, China and South Korea.
They crescendoed on Sunday in a final session pitting South Korea's "SK Telecom T1 K" against China's "OMG".
Fame and rigourIn the sold-out arena, thousands of spectators chanted the names of favourite players before the online battles began.
Each team had its own coach, who dished out last minute advice and encouragement to players.
Backstage, some warmed up in private rooms, others ate fruit and carbs to get ready.
"You need a healthy lifestyle to be a professional player," said Nicolas Laurent, in charge of international development at the California-based Riot Games.
"In fact, there are real differences between the Asian teams that are much more serious and the Americans or Europeans. And that often comes through in terms of results."
The winning team of this year's All-Star Paris 2014 championships will take home $50 000.
"Professional players often earn hundreds of thousands of euros a year," said Laurent, pointing to prize money or sponsorship deals.
Before integrating a professional team, the best of the best are often spotted on game servers by managers looking for the next big thing.
And once on the circuit, League of Legends players sometimes transfer to the competition.
Last week, for instance, Russia's Alex Ich left his team "Gambit Gaming" to join Sweden's "Ninjas in Pyjamas".
The United States has even decided to facilitate the visa process for foreign players in a bid to attract new talents to US teams.
As for retirement, it can hit early.
"Toyz" retired from the professional circuit when he was just 21, and has already decided what he wants to do next.
"I plan to become a team coach. That would be a natural evolution."