But they have bought their own stock back and they are even considering a whopping $100 billion dollar buyback [0].

[0]: https://qz.com/1611997/warren-buffett-hints-on-timing-of-big...

Yes, but Berkshire is a holding company, made up of a lot of companies that do pay dividends, are expected to eventually pay dividends, issue buybacks, or are themselves holding companies.