I take semiannual trips to NYC. Occasionally, I bring someone, but most of the time I go alone. Each trip, I see 6-8 shows. I love my trips. As others mentioned, it is hard to find someone that can see 6-8 Broadway shows in NYC. Certainly, I would love to have company, but unfortunately I can never find someone that loves Broadway as much as I do.
If you go alone, just be smart and be safe. Manhattan is safe, but you can also get yourself into trouble very easily.
Not to be confused with Dave19.