Then why would you ever call "safe" ???
Because if a ball goes in somewhere that you were not intending, you may have to shoot again and be hooked if you didn't call a safety.
Really, the only thing the option on a safety when a ball goes in does is prevent the player from being able to sink a duck, like if a ball is hanging in a pocket that you don't want to leave for your opponent so you call a safe and sink that ball.
Now that I re-read Joe's post, he didn't really address whether they were playing by the rule that the incoming player has the option on a miss when no ball goes down, I believe that's hoe they play the SBE. But even in regular ten ball you more or less need to commit to either a shot or a safety, except that in regular 10 Ball you still can play the two way shot of a call shot/safety. But if you miss and successfully hook your opponent, you better hope nothing went in.
Let me give an example of something that may come up. Say you are left with a kick shot and there is another ball hanging in the pocket near the ball you need to kick at. You may want to call that ball just in case it goes in. But you have to weigh that against calling it and having it not go in and being left hooked again when your opponent exercises his option. In many cases like this the player will indeed call something since the worst case would be that he would be left with what he's already facing, a kick shot. But the reward is if the ball does go in he stays at the table.
Now let's say you are left with a very difficult shot, or a fairly hard shot and no real way to get on the next ball if you make it. You may want to call a safety, hoping to get BIH and make it easier to deal with getting on the next ball. You can also call the shot but if you miss you may have to shoot again and face being hooked. It would probably be better to call the safety since you have a decent safety in front of you and if you call something you could face the worse situation of being hooked, or not having as a good a safety opportunity as you have right now. Again, you have to weigh your options and percentages and decide what to do. But the point is, there is a reason to call a safety even in standard 1o Ball rules, and even more so under the SBE rules.
If you're still not sure about this, maybe you can lay out a specific situation and I'll try to address it.