You are applying your YC bias to the word 'incubator'.
in·cu·ba·tor/ˈinkyəˌbātər/
Noun:
1. An enclosed apparatus providing a controlled environment for the care of premature babies.
2. An apparatus used to hatch eggs or grow microorganisms under controlled conditions.
I may be reading a lot in here, but are you saying that incubators are mostly just talent farms?