Huh? I was just in NYC, solo dining, and I typically spent around $20, and that usually included an appetizer and / or side and soft drink. I could have spent considerably less.
If you want something affordable and good, though perhaps a bit adventurous, try "118 Bagus Malaysia". It's on 1 Doyers St, a short walk from Canal St. in Chinatown. I got two delicious Roti Canai's, a delicious dish called "Nasi Lemak" (a ball of rice surrounded by different things to mix it with, e.g. pickled vegetables, an anchovies mix, etc.), and didn't spend much over $10.
I strongly recommend the site
http://www.menupages.com . If you're not ordering alcoholic beverages, most restaurants with $, $$, $$$, and perhaps even $$$$ should work for you.