I was at an in-person training session in DC a couple of years ago and met three long-time DC shoppers who use public transportation, exclusively.  In addition, it is quite common to do so in Manhattan and other transit-rich environments.  I know that, once in center city DC, I can walk very little and do a lot of shops in a day!  Banks are so thick on the ground, for instance, that I could do 6 bank shops, for 6 different MSCs, with a guarantee that I could do a lunch shop at a Potbelly or a 5 Guys, a salad place, a DD, or a Chipotle, along the way.  
All that said, you do need a dense business district and a rich public transit system.  And, btw, increasingly, that system may well include a bike share system and protected bike lanes! 
where you located?
Based in MD, near DC
Shopping from the Carolinas to New York
Have video cam; will travel
Poor customer service?  Don't get mad; get video.
Edited 1 time(s). Last edit at 10/25/2016 01:04PM by walesmaven.