Switching to a menstrual cup... why haven't you?

I started using a menstrual cup this year and let me just say... I'll never go back!! For my friends who still prefer tampons, I'd love to know more about why.

Edit: I intended for a curious tone with this post because I was really impressed by the product when I finally figured out how to use it, and wanted to know more about why people chose to use other options. I understand that people have different preferences, anatomies, and situations that don't necessarily make the cup the best option or even a possibility for them. I've learned so much by reading the detailed responses everyone has left on this post, so thank you!