The cynical view would be this is a trap to just seize people's house whenever they want. Tracing RMT money is basically impossible because it's the same issue as money laundering. Let's say I buy 100M from RMT. I put 5M in guild bank. I buy 9999 Fire shards for 200K, a Vanya Hat for 1.5M, and so on. The guy who sold the Vanya Hat probably then put that money to buy more stuff, and probably some of it into buying a house as well. Before you know it, everyone's got this tainted money. Sure, it's easy to notice the first step where I bought 100M from a RMT, but what about the guy who sold me a Vanya Hat for 1.5M? You can argue no one would pay that much for it, but who are you to tell me what I do with my money? What if I'm just clueless and don't care about massively overpaying because I just bought 100M? Or is that guy selling the Vanya Hat someone I know to make the money look legit? You can't possibly sort this stuff out.