Models, body builders, actors, all do it.
Beautiful people are nice to look at, it's probably one of least weird concepts to grasp, i'd say.
Some fat neckbeard getting followers because he plays Nintendo games while saying nothing interesting on camera, is definitely harder to unpack.
I mean there's a lot of middle-ground between "curvy chick in booty shorts exposing her cleavage at every opportunity" and "hairy Jabba the Hutt mashing buttons with his fat sweaty hands".
What about a normal looking guy or girl who does say interesting things?
You gotta play with your assets tho.
If you're born with nice tits, but a shit sense of humor, you play those cards.
Besides, what passes for "interesting things to say" is extremely subjective, clearly, or channels like GameXplain wouldn't exist.
That said, if you're looking for tits there are clearly better avenues than Twicth to look for them, but i guess it's more of a GFE of sort, these ethots are selling.