I don’t think so.
One of my friends who prepared from Delhi, used to tell me that in the olden times, Delhi was a graveyard of Kings and Sufis. Nowadays, it is a graveyard of UPSC aspirants. I believe this to be true.
These days, most coaching material is easily available online. The relevance of coaching centres also has been lost with the change in the pattern and also numerous online players like insights and vision.
I think living in a congested room in the sweltering heat of Delhi and trying to concentrate on studies is like meditating on one leg. If you can do without it so much the better. If you have to do it and still you come out successful through the other end, they might as well appoint you as Secretary to the Moon and still you will emerge successful for that is easy as compared to this.
Out of the total number of candidates studying from Delhi, only a few of them clear this exam, if you take the ratio. I don’t think Delhi has anything to do with this. It has more to do with their calibre.