The tax system would definetly not be a good idea,
even if I don't buy tc that idea sounds horrible and would menace the shops, the items, and the current topic: the tc. Thinking about the subject the tc rate (2-3) months ago was around 8k/$ now it's up to I've seen 13k/$. Either we raise market and shop items or we force a lower /$ ratio because the game isn't about being skillful and getting tc it's about seeing how much money you can make irl to buy a shit ton of crap here.