DHGate is basically counterfeit importing, if you buy the stuff on there as a consumer you're just getting shafted by terrible quality products and hurting the local economy. If you sell the stuff on there in the UK you're looking at a big kick from trading standards likely including jail time and/or big fines.
Furthermore, when it comes to technology it's beyond stupid to buy anything but the real deal. People in the UK don't walk around with fake beats on, in the same way that people don't buy the body of a Aston Martin, strap it to their backs, shove on some roller skates and big boy it down the motorway. You get what you pay for, unless it's fake, then you get less than what you pay for.