Roblox loses heavily and gains slightly. what I mean is, tons of kids join Roblox. most of them spend no more than 800 robux on average. but many veterans and rich people leave or just give up on trying to be rich (for those with limiteds) because of a huge lack of security because Roblox is hungry for money so they don't care about improving the security. I got to talk with some veterans ranging from 2007 to 2012. many of them say, 2012 (or early 2013) is when roblox started going down, as of eric cassel death.
While many kids join Roblox, many veterans, which are the center, the core of Roblox, start leaving Roblox. It's not always the money and the far away part of roblox (the new people) that matters but it's veterans too. Those guys are who you should listen to as they know the whole history of Roblox, its important details and everything, but if they leave not because it got boring for them, but because/and of Roblox's huge flaws and issues, you know that's not cool and good. As well as those guys do know a lot about Roblox, their way of rating the game can affect some people who read those. (parents/guardians) You won't trust that much someone who just played for few hours, but if someone played a game for long years, you might wanna trust him at least a bit by that review. And thus Roblox will die eventually in my opinion, of course, guys you can say different, I don't have a problem with that, I just don't think it'll live for a long time.
