+1If TAB=hobbyist and enthusiast and that's what you are, there's no harm in staying in your comfort zone. Just know that you'll be cutting yourself off from a lot of the World's Great Music at worst and relying on someone else's opinion of where to play the notes on your bass at best. There are a lot of ways to learn how to imitate that didn't exist even 10 years ago (Youtube, etc.) but to take it to the next level studying reading and theory is what will open a lot of doors really fast.
Echoing what Roy said- it will open doors if you know the major forms of communication in music, whether in standard notation or in the numbers. But if you are going to be doing one kind of gig for the rest of your life and you are content with that, then there it is.
