Is it generally worth it to get books signed, or not?

I know this varies a lot depending on the book and the person signing it, but considering that a signature might cost about $25, Signature Series costs $20 more than blue label, and if you need a facilitator that can add another $20-30, you're looking at adding $50-75 to the cost of the book.

But when I look at sold listings for various slabs versus the same thing signed, it doesn't really seem like there's much difference in price.

Curious what you all have found in your experience.