I wasn't interested in streamers at all, until I discovered Vtubers. And I didn't even care about them that much at first, either. But some streamers have entertaining personality or social skills that make it fun to watch them play. Another bonus is the people who watch them are also pleasant to talk to. We can chat about why certain characters do certain things, or how certain events happened. This of course can't work for streamers with high number of viewers because chat will always go faster than the speed of sound. So I don't watch them.
Seeing the streamer goes through the game while providing commentary can be fun, too. I don't watch the whole stream, though. If it's a one or two hour stream, and I happen to be eating or working on something else, I'd have the stream running in a different tab and sometimes chime in some comments. If it's longer than that, then no, no way would I ever be able to watch a stream that long.
I'm very picky at choosing which youtubers to follow. The typical generic loudmouth "WHATS UP HOMIES PLZ LIKE SUBCRIBE" idiots, I never care for.