I have written many times about the problem with fraud on Skype, unauthorized calls, hacked accounts, drained account balances, and especially the "blame-the-customer" attitude of Skype "support", if you can even get a response out of them. It has been this way for as long as I can remember, and it is obviously not changing. Here is a TechEYE.net article detailing first-hand experience with fraud and Skype's reaction to it.
The moral is clear, and is the same as I have been saying for years. Do NOT give any money to Skype, under any circumstances. If you feel that you can't live without their free services, because you don't like the alternatives or because "all your friends" are on Skype, then fine, go ahead and use the free service. But don't risk putting any money on your "Skype Account", and for heaven's sake, don't register a credit card, PayPal or other "auto-charge" feature with them. It's bad enough when your account balance of 10 or 20 dollars is drained, but with auto-charge the damage can be tremedous. Period.