Need further proof that Rockstar's online games are the cornerstone of its business these days? You just got it. Publisher Take-Two has reported that its profit jumped 39 percent year-over-year in the spring quarter to a hefty $540.5 million, and the in-game purchases for Rockstar's titles played a large role. Company chief Strauss Zelnick told Hollywood Reporter that GTA Online "actually grew" versus 2018, while Red Dead Online's early performance has "exceeded expectations." Games like NBA 2K19, the Borderlands series and Civilization VI helped, but it's no secret as to which ones were the biggest cash cows.