I take no issue with those asking for free work. Some of my favorite jobs I was unfortunately working for free. (they were exceptions though) I have owned and operated a number of businesses and one counter intuitive fact I have learned is people don't really work hardest for money. When it comes down to it there are more powerful motivators.
Low budget indies and pizza/junk food are synonymous, I really appreciate good food, but got to choose ones battles. If I am working low budget I usually come with a brown bag lunch like a badass, and focus on the work. This all said In my experience if you cant raise a few thousand dollars (as a producer/director) for an art film/short film/experimental film/etc than you probably cant make a movie.. Lots of content these days, not a ton of quality, certainly not more than yesteryear. Making a film is difficult. Working any job and saving a few grand to pay a crew is easy. SO... I dont work for free, not because of the money or food.. Because 9 out of 10 it will be uncommitted people doing marginal uninspiring derivative junk and will urk you every time you see the imdb reminder. However if I choose to show up for free I will work my butt off without complaints!
So JD I feel your pain, but don't let it get to you!