Wow, you guys are really coming out on the side of big morality here, which in this case is also the side of big business and big government. Perhaps this makes sense where you are, but it does not make sense everywhere.
Where I live, anything more than thirty bucks brought across the border is assumed to be for commercial purposes. When I imported my own belongings the government assumed I was going to use my own clothing and dishes for commercial purposes and was ready to assign me tax at 22%, duty, service fees, etc. etc. all piled on top of one another.
So I took some advice from my import/export agent.
The government has a cash cow, money grab operation in place, pure and simple. If I can get around this type of a swindle with an agreement on declared value between buyer and seller, then I will. And many reputable people here on the forums and elsewhere do this as a matter of course. I always state in any such transaction that I realise this limits my recourse when it comes to insurance, etc.
(But hey, insurance is another of the great scams of modern society.)
Unjust laws are made to be challenged or circumvented by any and all means. This is a victimless "crime", if indeed a crime it is.
Do unscrupulous people use this method to rip off sellers? I have never heard of it happening. There are plenty of other simple ways to accomplish the same goal. No reason to single out this one for special attention.
P.S. This has nothing to do with PayPal or any other specific payment method.