Why not use exceptions as regular flow of control?

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Have you ever tried to debug a program raising five exceptions per second in the normal course of operation ?

I have.

The program was quite complex (it was a distributed calculation server), and a slight modification at one side of the program could easily break something in a totally different place.

I wish I could just have launched the program and wait for exceptions to occur, but there were around 200 exceptions during the start-up in the normal course of operations

My point : if you use exceptions for normal situations, how do you locate unusual (ie exceptional) situations ?

Of course, there are other strong reasons not to use exceptions too much, especially performance-wise

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