Here's why:
* Celebrities receive a LOT of mail: They likely don't have the resources to respond to every letter, especially if they have to pay for postage.
* Privacy concerns: Sharing your address might not be something you're comfortable with, especially if you're a fan.
* Focus on the message: Instead of focusing on getting a reply, focus on crafting a genuine and interesting letter that shows your interest in the celebrity's work.
However, there are a few situations where a SASE might be appropriate:
* If you're requesting an autograph: Some celebrities or their management teams might be more likely to respond if you include a SASE for them to send back a signed item.
* If you're sending a business proposal: In a professional context, including a SASE for a reply is a common courtesy.
Ultimately, it's up to you whether you want to include a SASE. Just be aware that it's unlikely to guarantee a response.