You say it "was a ton of money," but you haven't provided any reasons that is the case, other than claiming that Google would not exist otherwise, something we don't really know either. Maybe Larry and Sergey didn't really need that 100k either, but took it just in case? And even if it were a lot of money at the time, 1999 was a different time and place. First-time founders were a lot less sophisticated. The seed funding environment that exists today didn't exist. AngelList did not exist. The current market rate for engineers and cost of living is a lot higher than then.