Well basically, now a days if you want things to change and new stuff you got to sacrifice something. My point is that if we keep thinking that adding something will make the economy fall into pieces, then we will just stand where we are and just don't get anything new.
To make changes you have to take some risks, sometimes the risks are for good and sometimes just aren't.
The thing here is that there is a lot of people that is afraid of changes, but guess what, this is a game and it is all database, codes, encryption and those can be modified to how they were before. So we could just give this a try, be a bit open minded. It has been done before, implements something to test it out and then just change it to how it was before, make some fixes, or just completely remove it from the game.
About the economy, basically that is how the world works, every time there is something new on the market the prices go high, but with the time and demands the prices go down. For example and I will base this on the game since that is what you want. When I bought my Red Sacred Wings when they first came out I spent 6k Tokens on them, and what is the price now? 3.5k - 3.9k?. So yeah around 2k down in just a few months.
Plus I do not consider that making such a meaningless change on damage on a rucksack will make the price of this rucksack hit lets say if the price now is 5k it could get to like what 6k and then in about 2 more months get to 5k again?
Exclusive things are made to have exclusive features than just colors. If you buy a Standard Ferrari with 450 HP the next month they will release an Special Edition of the same car with 470 HP. Waoh that is just 20 HP more, and the price is like what 20k Dollars higher than the Standard Edition, eventually the price will go down but it is the exclusiveness of the car that matters, and that is what we want from the car. Think of Ferrari as the GvG, the company just make some innovation to call peoples attention, it is called business.