Can you fire your trouble customers?

Maybe you've read about this lately. Apparently,Sprint-Nextel "fired" customers who called customer service disproportionately more often. These customers had called 100s of times in 6 months about minor issues. The company decided these folks were costing more than the profit they represented, so they sent letters telling them Sprint-Nextel decided they would no longer serve these unhappy customers.
http://www.searchrank.com/blog/2007/07/when-is-it-time-to-fire-your-customers.html

I work in a retail setting and I know for a fact that "the customer is NOT always right". In today's increasingly litigious society, some customers a true liability. The costs to serve them negate any profit they represent. I would love to fire some of my customers! I say kudos to a company who tells it's PITA customers "no more!"

We have these one man, on social security, disability, public assistance, who constantly complains and threatens us that he is calling his attorney, Dallas-Hartman. Now I don't know how a man with no income retains a personal attorney, let alone pays his legal fees, so I'm not too frightened, but what if he did? He's already wasted our time on numerous frivolous complaints. What if he found some reason to tie us up in a court battle, just because he is such a bitter, litigious person? I sure hope my company would back me up. Still, why would I want to put up with this?

In the past I have told customers "no more". Go elsewhere. usually because of drug seeking tendencies, not usually just customer service issues. If a customer is plainly dishonest with me, I will also tell them not to come back. However, when they go to corporate and corporate kisses their ass by sending them coupons and gift cards I feel as if I'm not being backed up while they reward some a-hole for his horrible behavior.