It's the fact he risked 40k to get 3k. That's DUMB! If Tenn won by 60 it's still dumb.
So you knew what Tennessee's chances were before the game even started? If Tennessee had a 93% chance or better, laying -1300 was a profitable bet long term. Which seems like a smart bet to me (actual amount to risk would depends on how much money would be left over to continue making more profitable bets on the 7% chance in loses).
If someone goes up to a roulette wheel and bets $3,000 on 17 black, is the casino making a DUMB bet by risking $105,000 to win only $3k?