People need to stop completing projects for clients under market prices (i.e., minimum wage). This drags the entire art market down and damages your future as an artist, damages other artists' livelihoods, and negatively affects the art industry as a whole (e.g., client perspective of the value of an artist's time/skill).
Artists need to be professional, and they need to treat their work as something that consumes resources (time, equipment/supply cost, etc.). I am surprised by how many people believe an artist will do work for free, or for the "idea" of success...that someone can bait an artist and their hard-earned and practiced skills by saying "you will be paid when I get paid...if the project is successful." There are also people out there who think an artist's work is theirs to use any way they want once they receive the commissioned art, without ever discussing it with the artist - or worse - without the artist taking the client aside and explaining copyright and licensin