I think it depends on what your goal is. I used to live in London and had to deal with many different accents, so learning or at least getting used to them is a good thing in my opinion. You will be able to understand more people and will feel more comfortable in different situations. And, obviously, you can't predict who you will meet on your way during learning, so I think having an idea about different accents is very good :) I now learn Spanish and do the same thing - I live in Barcelona, but trying to get involved in different accents, I have friends from Spain, Argentina (this is like a completely different language to me!), Venezuela and Mexico. They all speak differently, but for me, this is the best way to learn and be able to understand different people. Good luck!