I don't think so, not so much. I suspect we're all experts to some degree at the myriad of reasons one has for giving up on a project. There's no reason to suspect the YC founders have any special reasons for giving up.
You'd probably benefit a lot more analyzing the reasons why you personally give up on projects than why someone else has.
I'm not interested in the abstract reasons why people give up ("ran out of funding", "founders broke up", "burnout", etc.). We know all those, definitely. What I'm interested in are the specifics. What specific decisions (and in what contexts) led to a lack of funds, what specific disputes or personal issues led to founders breaking up, what shifts in the market made their startup not viable, and so on. That's the real world data that we don't necessarily have from experience.
I think people give up mainly due to lack of momentum leading to lack of motivation.
I can tell you how we failed with our first product. Bad design choices (that people would accept a large client download, that Mac wasn't that important) and a bad UI meant a bad user experience. Plus a lack of up front planning about why would users want to use us. Therefore the users never returned - the lack of momentum had a big negative effect on morale. Every day in the office was miserable then because we knew people weren't using/enjoying our product and we weren't growing.
We made a tough choice to abandon that first product and our new site is starting to rock and is heading in right direction. The positive momentum has such a big impact on morale and every day hearing a user say "I'm so glad I found this site" is best motivation to keep going through all startup challenges. So it comes back to momentum from users, and that comes back to good design and understanding what people want and why they would use your product.
But that's a great example of a lesson to be learned from stories about quitting: sometimes you do it because a hard reset is the best option. Knowing where that point lies is valuable knowledge.
Personally, I want to hear stories about failure more than stories about success. Stories about success are boring and repetitive, because they usually revolve around some combination of luck and persistence. But the truly hard decisions in life come when you're spinning your wheels, and you need to determine when it's time to cut your losses.
once we finally made the tough decision to abandon the first product, then designing and making the second product was so much (3-4x) faster, as we knew exactly what sucked the first time around and how to avoid all the inefficiencies as well.
so i guess, actually failure was very valuable. i actually see 3-4 much larger / better funded startups in our field who now are repeating the mistakes we made in our first product, but somehow I guess they won't be able to make that decision to change course.. easy when you're smaller and flexible.
You'd probably benefit a lot more analyzing the reasons why you personally give up on projects than why someone else has.