I'm not sama, but I did attend YC a few years ago so I will try to chime in a bit here based on my experiences.
First, you are right - every YC partner has very limited time, and if you expect to get a lot of it for anything and everything you will be disappointed. YC wouldn't scale that way, and it would be a waste of the partners' time.
That said, if you ever NEED a partners time, they will bend over backwards to make it happen, regardless of whether you just sold for $1b, were personal friends with them, or whatever else.
First, you are right - every YC partner has very limited time, and if you expect to get a lot of it for anything and everything you will be disappointed. YC wouldn't scale that way, and it would be a waste of the partners' time.
That said, if you ever NEED a partners time, they will bend over backwards to make it happen, regardless of whether you just sold for $1b, were personal friends with them, or whatever else.