When you are done with your combat training, you can sell your berserker ring. Total loss: 500k (allowing for fluctuations in price) When you are done with your combat training, you cannot sell your ring if vigour. Total loss: 50k tokens. Let's consider the 50k tokens. Assuming that you have every other reward, the tokens' only use is to recharge chaotic weapons (in which case 20k tokens saves 1.8m, therefore 50k tokens = 4.5m) or to buy xp (50k tokens = 50k xp which is about 40 minutes of work which is worth less than the 4.5m saved in repairs). By buying that ring, even if you have all the other rewards, you lose 4.5m. If you don't have all the other rewards, the cost is much higher.