Ehhhh... Aren't there syndicates standing ready with millions for every YC startup on Demo Day? I think YC acceptance is worth at least 10 million in funding.
It's not guaranteed, but it almost certainly raises the odds. The YC "brand" and investor exposure is quite valuable on its own, even independent of any other benefits.
Pretty sure I read about at least a few million automatically on demo day, depending on the startup my guess is getting up to 10 in the year following is not a bad bet. I suppose someone whould have to crunch the numbers.