Even though I don't sell art myself, I admit I kind of want to pinch people who rant about prices being "too high". I feel artists are free to price their time how they see fit; whether they are good, bad or indifferent, popular or unknown, art degree or self taught. Art is wonderful and good for the soul, but it is a luxury, not a necessity. If the buyer does not agree with the price, then they are free to continue to seek someone else to do the work for what they wish to pay, or even pick up a pencil and start drawing for themselves.

For example, unless these complainers are nuts, they wouldn't dream of going into Walmart and demanding the store sell them a $25 shirt for $5 because, "That's all it cost to make it in a Chinese sweatshop!" (even if it's true) so I really don't see where they get off trying to pull that stunt with an artist, musician or any other sort of craftsman. If you don't like the price, politely say "No, thank you," or "I'll think about it," and move on. The only time I can even see wheedling about it is if the buyer themselves is a craftsman has a skill* and/or product* of similar value they think they artist might like to trade for. That kind of bargaining is more reasonable.

*This of course is subjective and I'll leave it to the individuals to work out whether it's worthwhile or not.