Look, it benefits YC if you apply. They are trying to reduce the probability that you don't apply. It takes a lot of time and effort from you to put together a high quality pitch and very little for them to evaluate it. They lose nothing turning you down. They lose a lot if you are successful but didn't bother to apply.
The numbers are kind of a crock of shit for reasons others have articulated in this thread. YC is a business, this is a press release. Don't be shocked that it's transparent biz-dev bullshit. (But do be offended, and do let it reduce the probability that you do business with YC, because if they can't treat you like an intelligent customer, they're probably peddling snake oil.)
Edit: I'm not trying to discourage startups from seeking funding. I just hate pre-21st-century marketing hype. Developers live in a post-Cluetrain-manifesto universe, we expect intelligence, authenticity, and depth. Our currency is trust, you build trust by being correct, thorough, and sincere. The blog post was correct but shallow and insincere. That loses trust; lost trust means lost business.