1. You will have more opportunities to play. If you can read the score, chances are you can play the music.
2. You don't have to try to remember everything. In my experience, ear players forget, over time, the nuances of the music they are recreating. For example, I used to play in a hobby classic rock band. Me and the bass player scored out our parts. For better or worse, we sounded the same every week. However, others in the band were always forgetting parts and therefore wasted our time sorting out what they should have known.
3. You will learn the music much faster.
4. You will have a deeper understanding of music than non-readers. It doesn't mean that you can't be a skillful player, but you will have to work harder. The geniuses who played great and didn't read, were geniuses. Perhaps you too are a genius, but I doubt it.
5. Readers can play with less stress because they don't have to rely on their memory so much.
What I'm up to behind the scenes.