"I wonder if this is a good way to launder money..."
It sure is. You open up two Paypal and Ebay accounts. One registered to your home country and one to the country you want to smuggle money to. Have an accomplice in the other country set up a bogus buy it now auction for some piece of crap at a ridiculous price that you know nobody will ever pay then you buy it and pay for it through Paypal and be sure you set up autosweep on the account you are paying into so the money gets sent to the bank account of your choice at the end of each business day then your contact in the other country goes to a cash machine and withdraws the money and it vanishes. As long as you can keep up the illusion of being a legit seller/buyer the plan can't fail. you may have to make a few sales to some real customers, though, to reduce suspicion. An ebay seller moving thousands of items a month to only one customer is going to look very suspicious.