Is it an advantage to be a gossip?

It doesn't have to be this way. If you are dealing with strangers, you may say that such people have advantages, and people will understand them better over time. In fact, even if you don't say it, you know exactly who the other person is. Even if you talk nonsense, the most important thing is that others may not believe you. I think being an honest and trustworthy person may sometimes suffer, but most people will like you.