Seems he got kicked out from his favorite spot outside New York City's Metropolitan Museum of Art for failure to pay his rent of $53,558 per month. More on this article on Slate.com
 Link to the article

There has been a discussion on Reddit.com on to how the Hotdog seller afford such a hefty amount on Rent.
Link to the discussion thread

Feel bad, may be it was not a good decision to take such a high risk without considering other constraints. There is a saying :"No risk No gain, higher the risk higher the gain".