Writing specs may feel like playing the Lotto. Over time, you may spend a lot of time and even money (buying software and books, hiring consultants, attending seminars, etc.) and feel like you are getting nothing in return. You may not get a sale, but you will get exposure. And you will be getting much-needed screenwriting experience.
Just like any other skill, writing is improved by repeatedly doing it over and over. And though, I feel I am a better producer than writer, I try to write as much as I can so I can be a better overall storyteller. So as I am developing the projects I am producing, I am also writing my own scripts. If any get made, great! If not, that's fine too. I am investing in myself as a storyteller.
Not every producer writes. I enjoy writing so I make sure to include it in my own filmmaking journey. I also feel it allows me to enhance my development skills. How can I help a screenplay improve if I'm not increasing my own knowledge of what makes a great film? So if you have no desire to write, try to include the study of screenwriting in your own development as a producer or director.