Depop

Now i have a love hate relationship with Depop. Now Depop is great place to find y2k/ Mcbling fashion and it's a great way to sell clothes. NOW MY PROBLEM..... i have seen/ know people who have purposely bought things at thrift stores and then resold it on Depop for wayyy to much money. For example someone bought a ed hardy hat for 15 dollars at the thrift store and then sold it on depop for 90 dollars like......WHAT?. Now this isn't everyone it's just some people i've seen before.