There are other things to talk about besides gossiping. Besides, I don't gossip so if I started gossiping in the house then I wouldn't be true to myself.
Who really cares about alliances or whatever, the only thing that the housemates should be concerned about is entertaining the audience. I would rather see someone saved because of how entertaining they are, not because of how much they gossip.
They're in a house with no outside stimulation and no escape from each other 24/7. They're also given tasks by BB with the purpose of testing them. People gossip at work and yet you think you wouldn't gossip in the BB house?! Every single person in there has.
As far as HMs entertaining the audience, you do realise this isn't a talent show, yeah? It's about watching how people interact when they're removed from the real world and cooped up together. Not everyone is a clown or a cheater or a magician or a loudmouth.