Who would pay $50 to have a registered legal letter cancelling your subscription or service physically mailed to these organizations, and then with a registry of case numbers for credit reporting so that when collections buys the "debt" from the company, they can reference whether the person has executed this cancellation or not?

If it saved you a couple of hours on the phone, was legally compliant and protected your credit, and forced the company to stop, and was just "point and shoot," would you use it?