Actually, if someone is selling services that are objectively unreasonable (either because the are worthless or excessively priced) then they can face potential civil and criminal lawsuits.
For example: many companies sell credit protection that will provide absolutely no service to the consumer. For those companies that really do nothing, they can be convicted for criminal fraud (or larceny by trick). However, these companies tend to disappear before a state attorney general gets around to prosecuting them. If the service is not entirely worthless but excessive then the company could face civil lawsuits for violation of consumer protection acts or lawsuits based on tort or contract law.
In addition, if the price is objectively excessive (to the point were no reasonable person would sign the contract), then the contract is voidable. However, convincing a judge that a contract is unreasonable or excessive is difficult as the judge probable makes over $120,000 a year and probably took a paycut to become a judge. Wealthy people (like judges, lawyers, and doctors) seem to be willing to pay just about anything for everything.
Anyways, enough on contract law.