Here's why:
* "Please" is an adverb. It modifies the verb and usually comes before the verb it modifies.
* Adverbs don't typically require commas before them. Think of it this way: "Please" is like an instruction or a polite request, and it's natural to place it directly before the action you're requesting.
Example:
* Correct: Could you please close the door?
* Incorrect: Could you, please, close the door?
However, there are some exceptions:
* When "please" is used as an interjection: In this case, it's a standalone expression, and a comma can be used to separate it from the rest of the sentence.
Example:
* Please, let me help you.
* When "please" is used to emphasize a request: A comma can be used to separate it from the rest of the sentence for dramatic effect.
Example:
* I need you to do this, please.
In general, though, you'll be safe sticking to the rule of not using a comma before "please."