Silicon Valley’s AI millionaires are paying eye-popping rates of up to $6,000 an hour — and $23,000 a day — for escorts who can discuss GPUs, artificial intelligence and the future of humanity before heading to the bedroom. A small but lucrative class of so-called “nerd-first” escorts is cashing in on the tech industry’s wealth explosion by marketing themselves as intellectually curious companions who can match clients’ obsession with AI, cryptocurrency, longevity and other futurist pursuits.