Warren's conversations are also short though. The difference is he invests in mature companies. He studies their books, then asks the CEO a few questions. If he

Warren's conversations are also short though. The difference is he invests in mature companies. He studies their books, then asks the CEO a few questions. If he likes the answers he invests. It's rather different from investing in a startup. Plus all of YC's startups presumably receive some boost from exposure on HN and reddit.