This is recurring theme with PayPal and some US citizens are perfectly aware that when it comes to dispute they'll get preferential treatment versus non-US base

This is recurring theme with PayPal and some US citizens are perfectly aware that when it comes to dispute they'll get preferential treatment versus non-US based seller and money returned no matter what. This mechanism is quite often used for frauds and unaware entrepreneurs can be robbed out of money - PayPal will refund money, close case without hesitation. I think that only solution would be to use court route but in some cases equipment cost may be lower than attorney and court related costs (in addition to seller not being used to procedures, not aware of what to do).