I had a few interactions with VCs (both professional and personal), where I didn't care because I wasn't benefitting from them. One of them was "an expert in CRISPR and blockchain" (WTF?) and... well I didn't need much time to see that he did not understand what a "hash" was. He was mostly an expert at repeating stories he had been told about how he would make a ton of money with the latest bullshit he didn't understand.
The truth is, it's like trading. You diversify the investments and hope that the economy goes up (respectively that one of the startups you invested in gets profitable). The only thing a VC has to do is verify that they don't invest in a fraud, but even that is hard given that they never understand the technology enough to say it's worth it (they often invest in shiny bullshit).