Didn't see this when I responded originally.
Plenty. You have to remember these streamers often play the same game for six hours a day; you pick up a thing or two from that, but big streamers also have literally thousands of people in their chat as real-time wikis and advisors, which is particularly huge for complex games like PoE, MHW etc.
You can eat out healthily easily in major cities for the past decade so that's not as accurate as it used to be. Eating out will always be more expensive than groceries.
This guy knows what's up. Unless you're really good at a particular game, or just get really lucky you're not going anywhere now.
Ryan Letourneau, aka Northernlion, aka Egg, aka Northern, aka God Gamer, comes to mind.