Why is a bad practice to distribute the Debug version of the application in .NET?

Reading this question, in the first comment, @Cody Gray says:

Erm, you know that you're not supposed
to redistribute the "Debug" version,
right?

I'm concerned about it. In Visual Studio, I usually develop my applications in Debug mode, and if I need to distribute the executable, all I do is zip the .exe and required .dll files (in bin\Debug folder).

Why is it a bad idea?

What is the difference between doing this and doing exactly the equivalent thing in Release mode?

Edit:

I asked this question time ago, but I just wanted to edit it to add a difference:

When using Debug.Assert in the code to test it, and compile in Release Mode, all those lines are gone, so that could be another difference.

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