Earlier quoted context omitted.
If strategy A is buying lottery tickets at $5 and strategy B is buying the lottery tickets at $10, A is twice as good off. It doesn't matter that the earnings are dominated by one single winning lottery ticket; strategy A is always twice as good as strategy B. So getting terms that are twice as good for a VC will double their expected earnings. Sure, if you just consider the winning ticket, it doesn't matter whether…
You're still not getting it. It doesn't matter how much of the lottery winnings you get, the only thing that matters is winning the lottery or not. 20% of DuckDuckGo is a rounding error compared to 10%, 5%, or even 1% of google.
If you really believe that the terms don't matter, then I'm sure lots of YC startups are happy to take money from you at terms that are 5x better than what YC offers.