Some of these youtubers cant help but overshare their personal lives online. Partly because they run out of content and talking about personal drama gets views, and partly they are just not very interesting and cant carry a show without injecting that personal fluffed up bullshit into videos.
Of course when you do that you can end up like boogie with alot of what he said coming back to bite him, or end up like Jim now (and boogie) with your core fanbase turned off by the changes and disgusting personal details they never wanted to know.
A lot of these gamer youtubers follow a pattern. Most of them stop playing games after awhile, shift to this personal drama content, then sputter out after awhile. Work is work no matter what it is, and eventually work gets tedious. You have to have that separation of work and play. They get burned out with video games doing it for work and play. None of them have any real skills or talent (many many youtubers were target/walmart/retail before hitting it big). When they run out of content, get bored of gaming, all they have left is personal fluffed up drama.
There are some long standing guys out there that still pull in views and are pretty consistent and separate their work/personal lives. Angry Video Game Nerd is a good example of how to do it right. Angry Joe too maybe though he does get himself in hot water here and there.