When selling a group, you will receive messages from numerous scammers trying to get the account for free. As for buying accounts, I'm not sure, as many of them have inflated metrics. Once, I lost 10,000 rubles, even though the seller claimed the inflation was minimal. So buy at your own risk; the administrators themselves say that they don't check for inflation at all. I also do not recommend Telegram exchanges for purchases: the prices are high, and there is a 99% chance that you will be scammed.