I don't watch webcams personally so maybe the market for that works differently than porn, but I'm not sure quantity over quality is going to work that way. If you're looking for porn are you going to watch the girl in the bikini lounging by the pool or are you going to watch the naked girl masturbating in the bathtub? Presumably Max's webcams are not the only choice people have to choose from even if we as players don't have access to anything else in this game.the only think is you are trying to get viewers and typically it is quantity over quality. They will be in the pool longer than they will be in the bathroom so which camera are you going to watch.
What about the girl laying on the couch fully clothed watching TV all day? Are you ever going to choose to watch that? I'm not. Now in terms of game mechanics you might be right and it might not make any difference what's happening in the room as long as someone is there, but that's not true in the real world and that certainly wouldn't be true if Max was just interested in watching for his own amusement either.
Even the game itself drives this point home eventually when Alice makes more progress with her blog. When all she's doing is solo lingerie shows she's not making much. She only starts really making money when she starts fucking Max on camera.