Ultimately I don't think exposure is "bad" or "good" - I think it's irrelevant to a good performer.
As for fooling magicians - it's usually pretty easy, honestly. There's a couple approaches, really. One is to use a method that most magicians would be too scared to imagine using. I use a ton of suggestion in my performances, and I will rely on it 100% in many cases with no backup if it doesn't 'work'. I used to try to teach this to other performers but they'd never have the guts to take the risks.
Another way is basically the same way you fool laymen - create a presentation that leads them down the garden path so they end up cancelling out their own ideas of how it's done without you ever having to say anything explicitly. I vaguely recall a good example of this from Luke Jermay, who apparently fooled the pants off Max Maven with a marked deck by saying, "And look, the deck is not marked" and showing it in a way that didn't reveal the marks.
However, I would be remiss if I didn't mention this - I don't think "fooling" should ever be a goal in the performance of magic. In my opinion, "engaging" is a far better goal and will make for more satisfied audiences.