For Joe to be 10000x more valuable than Frank, a given company must prefer to have one day of Joe's time, rather than 27 years of Frank's time. Is that possible? Absolutely. Maybe Joe can spend that day calling up an old friend from Harvard and get an extremely valuable deal going. Even if the deal doesn't close that day, the other execs can get it closed now that Joe got the ball rolling and made the right introductions. This can easily be worth hundreds of millions.
Maybe Frank has no useful skills, and is extremely lazy on top of that. He might be yours for 27 years, but he'll do his job badly, lower morale, and make lots of screw-ups that his co-workers have to fix.
Now, I'm not saying that every CEO is like Joe or every minimum-wage worker is like Frank, but you (the reader) know that there are definitely people out there like each of those. Hence, one person's time can be 10000x times more valuable than another's.