And this is why Y Combinator may not be right for your startup. The 100 billion dollars of valuation listed on YC's website may not be up to date, but it's clear that the top 10% of companies make up the overwhelming majority of their portfolio. So they go for moonshots. And they also invest in multiple competitors in the same space in the hopes that one will pan out.
So if you're building the kind of company that might be worth $100 million someday but won't ever be worth $100 billion, VCs and startup incubators might not be right for you, but just remember that a rejection from them doesn't necessarily mean you aren't on to something great.