Picking people is also hard, but if you narrow it down to:

1) folks who follow the directions on the application, 2) have the technical ability to build, 3) demonstrate high achievement in school/career, 4) show commitment/persistence, 5) have an idea that makes some sense, 6) are able to clearly communicate the idea, 7) have good team dynamics, 8) have some plausible strategy for growth

AND are willing to sell 7% of their startup for 125K

then the resulting pool of startups is probably smaller than you would think.