With a 9% edge and kelly betting a 100 unit bankroll will turn into a 200 unit bankroll in just 10 bets, a 300 unit bankroll in just 15 bets, a million dollar bankroll in just 41 bets. Of course these are averages.
Using a conservative half kelly would take just twice as many bets.
If you bet other people's money for a 10% take you are cutting your edge to less than 1%. So no, it don't make sense to make other people money when you can make it all for yourself at a very fast pace using kelly. That is, if you are a 57% college football handicapper.
I've never seen redietz write about kelly betting much less whether he used it or not. He definitely SHOULD HAVE used it.