Why are so many people fretting about not getting into YC and why do crappy stories like this get upvoted? If getting into Y-Combinator was your idea of validation, your startup is doomed anyways.
I simply don't understand the obsession of founders with getting into YC. If you are a founder and you are really passionate about an idea, you simply don't have time to think about "how to game the system and get into an incubator". You have more important things to think about - like product-market fit, hiring the right people etc. etc. In Aileen's Lee recent article about unicorns or billion dollar startups - 2 out of 39 were YC companies, the rest 37 were not.
Being part of YC adds a whole new dimension of political clout and credibility irregardless. It's definitely a 'who you know' rather than 'what you know' notch on the belt beyond simple validation. Saying you were part of it may be worth something to the right people at the right time, one day.
So, it's "bragging rights". But, temporary bragging rights considering the fact that they have at least ~100 teams per year and unless your startup goes somewhere after YC, you're just wasting your time.