tangor - 8:09 am on Mar 5, 2011 (gmt 0)
One of my sites, offering a very unique item, was so hard hit by these kind of customers I changed my payment model:
Money Order or Cashier's Check. Credit Cards or Paypal Not Allowed.
Sales remained about the same but the other b.s. ala chargeback or failure to abide by the sale vanished nearly overnight. :)
Above won't work for everyone, but might make a difference for some.