As I understand it the full court press isn't used all of the time because it has a tendancy to leave the defending basket more vulnerable once the opponent manages to get the ball down the court (some of the defending players are still down towards the other basket).
This applies in business as well. Sometimes its best to defend your core business (your basket) tightly and let the competition have its way on the outskirts (their side of the court) of what is important to you. You can't always be defending everything all at once. I guess it boils down to how you manage risks.
Also one of the things to keep in mind is that the offense usually adapts pretty quickly, since there are very effective measures againts any kind of press. So in general you do not play press for long stretches at once, if you are going against someone at least your own strength. Mixing in the press for little spurts though, is generally a good help, if properly executed.
http://news.ycombinator.com/item?id=592043
http://news.ycombinator.com/item?id=605720