Earlier quoted context omitted.
I think there's something to be said about knowing when to fold, and not to view these nobody-believed-in-us-but-we-overcame edge cases as motivation to play a losing hand. There will always be false negatives, ideas that are rejected by angels but which later become enormously successful. However, if the industry's finest angels are all passing, and you can literally find nobody to invest, it is probably a wise deci…
I can think of cases where startups have found no one to invest, and have ended up doing well. This is where something like YC can help, actually; we can tell people candidly whether we think it's the investors who are wrong, or the startup.
Ebay for Spaces is a very clever shorthand, but it seems just abstract enough to question without a concrete instance. Now, of course, it is one of those brilliant with hindsight instances that seem easy but require immense dedication.