You were close to hit the nail in the head by a tiny gazillion light years. What would you grind the TWEN items with? Tokens for them? (L)?
I don't know what prices will be then of if the current prices are NORMAL or why NORMAL people want NORMAL prices for "exceptional" items... but today's prices are what they are because one main thing: demand. If people won't pay 500k for a sword (LOL!) that means the price of the sword it's not what the seller asks, but just until someone is willing to pay for it. But people will want tool to grind TWEN, not just to sell their tools at premium prices because TWEN will probably make a an active hunter, in some cases, at least twice the price of their weapon...
I hope fewer people fall into the trap of staying on the side and commenting on the prices of things that pass by... I've seen these topics since forever. If ppl wanna do dailies up to rank 2, they don't have to wish for top of the line weapons, use a LC150 (L), it's fine for your activities...