His interest is actually the same as for any kind of certification, and that is to increase the number of people getting certified for as long as the certification is seen as having value.
Thus it is a little scary that every Y-combinator class is bigger than the previous one.
However he is also figuring out how to scale the model and provide more assistance. For example current graduates benefit from finer tuned screening, have more kinds of assistance available, better assistance (pg knows more than he did when he started), a bigger network to draw on, and save more otherwise wasted fundraising time.
On balance the result is that classes seem to be getting better, not worse.
However I guarantee that a point will be reached where the Y-combinator model can't keep improving and growing at the same time. At that point his personal financial interest will still be to keep growing the program. It will be interesting to see what happens then.
Thus it is a little scary that every Y-combinator class is bigger than the previous one.
However he is also figuring out how to scale the model and provide more assistance. For example current graduates benefit from finer tuned screening, have more kinds of assistance available, better assistance (pg knows more than he did when he started), a bigger network to draw on, and save more otherwise wasted fundraising time.
On balance the result is that classes seem to be getting better, not worse.
However I guarantee that a point will be reached where the Y-combinator model can't keep improving and growing at the same time. At that point his personal financial interest will still be to keep growing the program. It will be interesting to see what happens then.