Johnny, there are two trains of thought on this. The first one is essentially what you are saying. When playing two foul 9 ball, it was a requirement. And, when hustling, it can be a great advantage so you don't have to show your full speed.
On the other hand, the table dictates what you should do. Is the runnout there for your skill level? If yes, then run it. If not, then play safe. When playing safe, you should be going for a lockup safe, or at least a safe where he has to kick to make the hit. You don't play safe leaving open banks. So, in the other sense, one should play the table. It dictates what you should do to win.
edit: The other thing about playing the table and not your opponent, is the mental aspect. If you play the opponent, you can easily fall into one of two traps- The one Pidge fell into recently when he was way better than his opponent and still found a way to lose. And the other being when you feel you are outgunned and start choking on shots you should make. If you just play what is there, and not worry about the money or opponent, then your mental attitude will be much better and give you a better chance of winning.