I think what he's saying is that if you're buying, you're saying you think there is a better than 50% chance that something will happen. If you're selling, you're saying there is a better than 50% chance something will not happen.
For instance, if you were to say Buy/Sell MSU wins 7 games this year, you would buy if you thought there was a better than 50% chance that it happens, and you'd sell if you thought it was a less than 50% chance of happening.
In this case, to buy that MSU will win a title in the next 10 years, you're basically saying you think there is a better than 50% chance that it happens. I disagree with that, mainly because I think it'd be hard to agree that any program has a better than 50% chance at winning a title in the next 10 years.
If the buy/sell had been about making a CWS, then yea, I'd buy. However, once you get to a CWS, there are so many good teams that even if you're the best in the country, there is a good chance something will happen and you won't win it all.