Furthermore, regarding your question:
“When they finally do commit, statistically, are they happier than the guys who committed within the first ten dates?”
This is a completely irrelevant question. The answer may be yes and it may be no. But the guys who date 100 girls are NOT the guys who dated 10. The question that should be asked is, “Are theses guys happier than they would have been had THEY committed within the first ten dates?” And without a Navi, no one will ever have an answer.