They start at $100 for clean examples of the common ones and go up from there. The less common shoulder types as well as the dark or salt glazed with the cobalt can bring upwards of $300 on a good day.
I don't think so...
http://www.authentichistory.com/1898-1913/2-progressivism/8-quackery/index.html
"...On February 21, 1906, President Theodore Roosevelt signed the Pure Food and Drug Act. Some quacks were enormously successful. German immigrant William Radam started selling "Microbe Killer" throughout the United States in the 1880s. His project claimed to "Cure All Diseases," and even embossed the promise on the glass bottles in which the medicine was packaged. In fact, Radam's medicine was a therapeutically useless (and in large quantities actively poisonous) dilute solution of sulfuric acid, colored with red wine".